At one time Venerable Sāriputta and Venerable Mahākoṭṭhita were staying near Varanasi, in the deer park at Isipatana. …
Mahākoṭṭhita said to Sāriputta:
“Reverend Sāriputta, they speak of this thing called ‘knowledge’.
What is knowledge?
And how is a knowledgeable person defined?”
“Reverend, it’s when a learned noble disciple truly understands form, which is liable to originate … liable to vanish … liable to originate and vanish, as form which is liable to originate and vanish.
They truly understand feeling …
perception …
choices …
consciousness, which is liable to originate … liable to vanish … liable to originate and vanish, as consciousness which is liable to originate and vanish.
This is called knowledge.
And this is how a knowledgeable person is defined.”