John 20:29

Clement of Alexandria Stromata Book II

Faith, then, is not established by demonstration. "Blessed therefore those who, not having seen, yet have believed."[23]

Clement of Alexandria Stromata Book II

Now the followers of Basilides regard faith as natural, as they also refer it to choice, [representing it] as finding ideas by intellectual comprehension without demonstration; while the followers of Valentinus assign faith to us, the simple, but will have it that knowledge springs up in their own selves (who are saved by nature) through the advantage of a germ of superior excellence, saying that it is as far removed from faith as[24]

Tertullian On the Resurrection of the Flesh " Well, be it so; only let the same hope flow on from them to us! For if to them who saw, and therefore believed, such fruit then accrued to the operations of the flesh and the soul, how much more to us! For more "blessed," says Christ, "are they who have not seen, and yet have believed; "[228]