Dutiyaassāda sutta: Gratification (2nd)

At Varanasi.

“Reverend Sāriputta, they speak of this thing called ‘knowledge’. What is knowledge? And how is a knowing one defined?”

“Reverend, a learned noble disciple truly understands the gratification, the drawback, and the escape when it comes to form, feeling, perception, choices, and consciousness.

This is called knowledge. And this is how a knowing one is defined.”