Mahāpaññāsutta

sn55.62:1.1 “Mendicants, when four things are developed and cultivated they lead to great wisdom.

sn55.62:1.2 What four?

sn55.62:1.3 Associating with true persons, listening to the true teaching, rational application of mind, and practicing in line with the teaching.

sn55.62:1.4 When these four things are developed and cultivated they lead to great wisdom.”