Humility, unseeing, holds out its hand to be led, and of it is said, "Cursed be he who places a stumbling block in front of the blind man." Charity, seeing, chooses, as it were, to move less in its progress, in order not to desert humility.
As Augustine so famously asserted in Sermon 52, if you think you’ve understood something, whatever it is, it’s not God. The maxim might also be applied to Augustine himself.