A bhikkhu asks the Buddha about the nature of the world, the mind, and wisdom.

Ummagga sutta - Fundamental Questions

Then, a certain bhikkhu approached where the Blessed One was; having approached and paid homage, he sat down to one side. Sitting to one side, that bhikkhu said to the Blessed One:

"Venerable sir, what directs the world? By what is the world swept away? And under the influence of what arisen condition does it operate?"

"Good, good, bhikkhu. Your approach is good, your intuition is good, and your inquiry is good. Thus you ask, bhikkhu: 'Venerable sir, what directs the world? By what is the world swept away? And under the influence of what arisen condition does it operate?'"

"Yes, venerable sir."

"Indeed, bhikkhu, the world is directed by the mind, swept away by the mind, and it operates under the influence of the mind that has arisen."

"Good, venerable sir," that bhikkhu, rejoicing in what the Blessed One had said and expressing approval, then asked a further question:

"'A learned bearer of the Dhamma, a learned bearer of the Dhamma,' it is said, venerable sir. To what extent, venerable sir, is one called a learned bearer of the Dhamma?"

"Good, good, bhikkhu. Excellent indeed is your question, excellent your intuition, and beautiful your inquiry. Thus you ask, bhikkhu: 'A learned bearer of the Dhamma, a learned bearer of the Dhamma,' it is said, venerable sir. To what extent, venerable sir, is one considered a learned bearer of the Dhamma?"

"Yes, venerable sir."

"Many teachings have indeed been given by me, bhikkhu discourses, mixed verses, expositions, verses, inspired sayings, itivuttakas, birth stories, marvels, and analyses. If one understands the meaning of even a four-line verse, understands the Dhamma, and practices in accordance with the Dhamma, such a person is rightly called a well-learned bearer of the Dhamma; this is sufficient."

"Good, venerable sir," that bhikkhu, rejoicing and appreciating what the Blessed One had said, then asked a further question: "'Well-learned, deeply insightful through understanding,' it is said, venerable sir. To what extent, venerable sir, is one considered well-learned, deeply insightful through understanding?"

"Good, good, bhikkhu. Excellent indeed is your question, excellent your intuition, and beautiful your inquiry. Thus you ask, bhikkhu: 'Well-learned, deeply insightful through understanding, well-learned, deeply insightful through understanding,' it is said, venerable sir. To what extent, venerable sir, is one considered well-learned, deeply insightful through understanding?"

"Yes, venerable sir."

Here, bhikkhu, when a bhikkhu has heard 'this is suffering,' he thoroughly penetrates its meaning with wisdom; when he has heard 'this is the origin of suffering,' he thoroughly penetrates its meaning with wisdom; when he has heard 'this is the ending of suffering,' he thoroughly penetrates its meaning with wisdom; when he has heard 'this is the way of practice leading to the ending of suffering,' he thoroughly penetrates its meaning with wisdom. In this way, bhikkhu, one is considered well-learned, deeply insightful through understanding.

"Excellent, venerable sir," that bhikkhu, rejoicing and expressing appreciation for what the Blessed One had said, then asked a further question:

"'Wise and of great wisdom, wise and of great wisdom,' it is said, venerable sir. To what extent, venerable sir, is one considered wise and of great wisdom?"

"Good, good, bhikkhu. Excellent is your question, excellent your intuition, and beautiful your inquiry. Thus you ask, bhikkhu: 'Wise and of great wisdom, wise and of great wisdom,' it is said, venerable sir. To what extent, venerable sir, is one considered wise and of great wisdom?"

"Yes, venerable sir."

"Here, bhikkhu, a person wise and of great wisdom does not think for his own affliction, nor for the affliction of others, nor for the affliction of both. He contemplates, thinking only of the welfare, benefit, and happiness of himself, others, both, and indeed of the entire world. In this way, bhikkhu, one is considered wise and of great wisdom."