Dasuttarasutta 2.1.3

2.1.3

Aṭṭha hetū aṭṭha paccayā ādibrahmacariyikāya paññāya appaṭiladdhāya paṭilābhāya paṭiladdhāya bhiyyobhāvāya vepullāya bhāvanāya pāripūriyā saṃvattanti.

There are eight causes and reasons that lead to acquiring the wisdom fundamental to the spiritual life, and to its increase, growth, development, and fulfillment once it has been acquired.