Faith is to believe what you do not see; the reward of this faith is to see what you believe.
[Est autem fides credere quod nondum vides; cuius fidei merces est videre quod credis.]
Augustine of Hippo (354-430) Christian church father, philosopher, saint [b. Aurelius Augustinus]
Sermons, 43.1.1
Variant: "For what is faith unless it is to believe what you do not see?"