Knowledge keeps within the boundaries of nature in all its paths; but faith makes its journey above nature. Knowledge does not allow itself to experience anything that is ruinous to its nature, and it keeps far away from it; but faith readily submits itself to this and says, ‘Upon the asp and basilisk shalt thou tread, and thou shalt trample on the lion and the dragon.’ Fear accompanies knowledge; but confidence accompanies faith. The more a man journeys in the pathways of knowledge, the more he is shackled by fear and cannot be found worthy of freedom from it; but he who follows faith straightway becomes a free man and ruler of himself, and as a son of God he freely wields all things with authority.

St. Isaac the Syrian
"Ascetical Homilies" (Homily 52)