​MN 133 Mahakaccanabhaddekaratta Sutta: MahaKaccana and One Fortunate Attachment

Thus have i heard.

On one occasion the Blessed One was living at Rajagaha in the Park of the Hot Springs. Then, when it was near dawn, the venerable Samiddhi went to the hot springs to bathe his limbs. After bathing he came up out of the water and stood dressed in one robe, drying his limbs. Then, when the night was well advanced, a certain deity of beautiful appearance who illuminated the whole of the Hot Springs, approached the venerable Samiddhi. Standing at one side, the deity said to him:"Bhikkhu, do you remember the summary and exposition of 'One Who Has One Fortunate Attachment'?"

Venerable Samiddhi: "Friend, I do not remember the summary and exposition of 'One Who Has One Fortunate Attachment'. But friend, do you remember the summary and exposition ?"
Deity: "Bhikkhu, I too do not remember the summary and exposition of 'One Who Has One Fortunate Attachment.' But, bhikkhu, do you remember the stanza of 'One Who Has One Fortunate Attachment'?"
Venerable Samiddhi: "Friend, I do not remember the stanza . But, friend, do you remember the stanza of 'One Who Has One Fortunate Attachment'?"
Deity: "Bhikkhu, I too do not remember the stanza. But, bhikkhu, learn the summary and exposition of 'One Who Has One Fortunate Attachment.' Bhikkhu, master the summary and exposition of 'One Who Has One Fortunate Attachment.' Bhikkhu, remember the summary and exposition of 'One Who Has One Fortunate Attachment.' Bhikkhu, the summary and exposition of 'One Who Has One Fortunate Attachment' is beneficial, it belongs to the fundamentals of the holy life." 
​That is what was said by the deity, who thereupon vanished at once. Then, when the night was over, the venerable Samiddhi went to the Blessed One. After paying homage to him, he sat down at one side, he told the Blessed One all that had occurred, and said: "It would be good, venerable sir, if the Blessed One would teach me the summary and exposition of 'One Who Has One Fortunate Attachment.'"

Buddha: "Then, bhikkhu, listen and attend closely to what I shall say."
"Yes, venerable sir," the venerable Samiddhi replied.

The Blessed One said: 
"Let not a person revive the past Or on the future build his hopes;
For the past has been left behind And the future has not been reached.
Instead with insight let him see Each presently arisen state;
Let him know that and be sure of it, Invincibly, unshakeably.
Today the effort must be made; Tomorrow Death may come, who knows?
No bargain with Mortality Can keep him and his hordes away.
But one who dwells thus ardently, Relentlessly, by day, by night
It is he, the Peaceful Sage has said, Who has one fortunate attachment." 

That is what the Blessed One said. Having said this, the Sublime One rose from his seat and went into his dwelling. After the Blessed One had gone, the bhikkhus considered:"Now, friends, the Blessed One has risen from his seat and gone into his dwelling after giving a summary in brief without expounding the detailed meaning. Now who will expound this in detail?" Then they considered: "The venerable Maha Kaccana is praised by the Teacher and esteemed by his wise companions in the holy life. He is capable of expounding the detailed meaning. Suppose we went to him and asked him the meaning of this."

Then the bhikkhus went to the venerable Maha Kaccana and exchanged greetings with him. They told him what had taken place, adding: "Let the venerable Maha Kaccana expound it to us."

The venerable Maha Kaccana replied: "Friends, it is as though a man needing heartwood, seeking heartwood, thought that heartwood should be sought for among the branches and leaves of a great tree standing possessed of heartwood, after he had passed over the root and the trunk. And so it is with you, venerable sirs, that you think that I should be asked about the meaning of this, after you passed the Blessed One by when you were face to face with the Teacher. For knowing, the Blessed One knows; seeing, he sees; he is vision, he is knowledge, he is the Dhamma, he is the holy one; he is the sayer, the proclaimer, the elucidator of meaning, the giver of the Deathless, the lord of the Dhamma, the Tathagata. That was the time when you should have asked the Blessed One the meaning. As he told you, so you should have remembered it."

Bhikkhus: "Surely, friend Kaccana, knowing, the Blessed One knows; seeing, he sees; he is vision...the Tathagata. That was the time when we should have asked the Blessed One the meaning. As he told us, so we should have remembered it. Yet the venerable Maha Kaccana is praised by the Teacher and esteemed by his wise companions in the holy life. The venerable Maha Kaccana is capable of expounding the detailed meaning of this summary given in brief by the Blessed One without expounding the detailed meaning. Let the venerable Maha Kaccana expound it without finding it troublesome."

Venerable Maha Kaccana: "Then listen, friends, and attend closely to what I shall say."
"Yes, friend," the bhikkhus replied.
The venerable Maha Kaccana said this: "Friends, when the Blessed One rose from his seat and went into his dwelling after giving a summary in brief without expounding the detailed meaning, that is: 'Let not a person revive the past... Who has one fortunate attachment'... 
​I understand the detailed meaning of it to be as follows:"How, friends, does one revive the past? Thinking, 'My eye was thus in the past and forms were thus,' one's consciousness becomes bound up with desire and lust for that. Because one's consciousness is bound up with desire and lust, one delights in that. When one delights in that, one revives the past. "Thinking, 'My ear was thus in the past and sounds were thus...My nose and odors...My tongue and flavors...My body and tangibles...My mind was thus in the past and mind-objects were thus,' one's consciousness becomes bound up with desire and lust for that. Because one's consciousness is bound up with desire and lust, one delights in that. When one delights in that, one revives the past. That is how one revives the past."

"How does one not revive the past? Thinking, 'My eye was thus in the past and forms were thus,' one's consciousness does not become bound up with desire and lust for that. Because one's consciousness is not bound up with desire and lust, one does not delight in that. When one does not delight in that, one does not revive the past. "Thinking, 'My ear was thus in the past and sounds were thus...My nose and odors...My tongue and flavors...My body and tangibles...My mind was thus in the past and mind-objects were thus,' one's consciousness does not become bound up with desire and lust for that. Because one's consciousness is not bound up with desire and lust, one does not delight in that. When one does not delight in that, one does not revive the past. That is how one does not revive the past."

"How, friends, does one build up hope upon the future? Thinking, 'My eye may be thus in the future and forms may be thus,' one sets one's heart on obtaining what has not yet been obtained. Because one sets one's heart thus, one delights in that. When one delights in that, one builds up hope upon the future. "Thinking, 'My ear may be thus in the future and sounds may be thus...My nose and odors...My tongue and flavors...My body and tangibles...My mind may be thus in the future and mind-objects may be thus,' one sets one's heart on obtaining what has not yet been obtained. Because one sets one's heart thus, one delights in that. When one delights in that, one builds up hope upon the future. That is how one builds up hope upon the future. "
​"How, friends, does one not build up hope upon the future? Thinking, 'My eye may be thus in the future and forms may be thus,' one does not set one's heart on obtaining what has not yet been obtained. Because one does not set one's heart thus, one does not delight in that. When one does not delight in that, one does not build up hope upon the future. "Thinking, 'My ear may be thus in the future and sounds may be thus...My nose and odors...My tongue and flavors...My body and tangibles...My mind may be thus in the future and mind-objects may be thus， one does not set one's heart on obtaining what has not yet been obtained. Because one does not set one's heart thus, one does not delight in that. When one does not delight in that, one does not build up hope upon the future. That is how one does not build up hope upon the future. ”

"How is one vanquished in regard to presently arisen states? In regard to the eye and forms that are presently arisen, one's consciousness is bound up with desire and lust for that which is presently arisen. Because one's consciousness is bound up with desire and lust, one delights in that. .When one delights in that, one is vanquished in regard to presently arisen states. "In regard to the ear and sounds that are presently arisen...the nose and odours...the tongue and flavours...the body and tangibles... the mind and mind-objects that are presently arisen, one's consciousness is bound up with desire and lust for that which is presently arisen. Because one's consciousness is bound up with desire and lust, one delights in that. When one delights in that, one is vanquished in regard to presently arisen states. That is how one is vanquished in regard to presently arisen states. ”

"How is one invincible in regard to presently arisen states? In regard to the eye and forms that are presently arisen, one's consciousness is not bound up with desire and lust for that which is presently arisen. Because one's consciousness is not bound up with desire and lust, one does not delight in that. When one does not delight in that, one is invincible in regard to presently arisen states. "

“In regard to the ear and sounds that are presently arisen... the nose and odors...the tongue and flavors...the body and tangibles...the mind and mind-objects that are presently arisen, one's consciousness is not bound up with desire and lust for that which is presently arisen. Because one's consciousness is not bound up with desire and lust, one does not delight in that. When one does not delight in that, one is invincible in regard to presently arisen states. That is how one is invincible in regard to presently arisen states. ”
"Friends, when the Blessed One rose from his seat and went into his dwelling after giving a summary in brief without expounding the detailed meaning, that is: 
'Let not a person revive the past... Who has one fortunate attachment,' 
I understand the detailed meaning of this summary to be thus.

“Now, friends, if you wish, go to the Blessed One and ask him about the meaning of this. As the Blessed One explains it to you, so you should remember it." Then the bhikkhus, having delighted and rejoiced in the venerable Maha Kaccana's words, rose from their seats and went to the Blessed One. After paying homage to him, they sat down at one side and told the Blessed One all that had taken place after he had left, adding: "Then, venerable sir, we went to the venerable Maha Kaccana and asked him about the meaning. The venerable Maha Kaccana expounded the meaning to us with these terms, statements, and phrases."

Buddha:"Maha Kaccana is wise, bhikkhus, Maha Kaccana has great wisdom. If you had asked me the meaning of this, I would have explained it to you in the same way that Maha Kaccana has explained it. Such is its meaning, and so you should remember it."" 

That is what the Blessed One said. The bhikkhus were satisfied and delighted in the Blessed One's words. 
In summary a deity asked Venerable Samiddhi if he knows the sutta  "One Who Has One Fortunate Attachment" which the blessed one has expounded. He replied "No " and he was encouraged by the deity to learn it from the Buddha. He went to asked Buddha the stanza and the blessed one replied: 
"Let not a person revive the past Or on the future build his hopes;
For the past has been left behind And the future has not been reached.
Instead with insight let him see Each presently arisen state;
Let him know that and be sure of it, Invincibly, unshakeably.
Today the effort must be made; Tomorrow Death may come, who knows?
No bargain with Mortality Can keep him and his hordes away.
But one who dwells thus ardently, Relentlessly, by day, by night
It is he, the Peaceful Sage has said, Who has one fortunate attachment." 

Venerable Samiddhi and the others did not understand the stanza so they went to Venerable Maha Kaccana who expound the stanza in details to them. 
References: 
1. www.accesstoinsight.org
2. https://suttacentral.net/
3. The middle length discourses of the Buddha (Bhikkhu Bodhi)