For faith is understanding’s step; and understanding faith’s attainment

The mysteries and secrets of the kingdom of God first seek for believing men, that they may make them understanding. For faith is understanding’s step; and understanding faith’s attainment. This the Prophet expressly says to all who prematurely and in undue order look for understanding, and neglect faith. For he says, ‘Unless ye believe, you shall not understand.’ (Isa. 7.9, LXX)

Augustine, sermon 76 on the New Testament