On the Confusion of Languages (101-105)

And they are represented as baking the bricks in the fire, for the purpose of intimating by this symbolical expression that they are strengthened and hardened as to their vices and their passions by warm and most energetic reason, so that they can never be overthrown by the body-guards of wisdom, by whom engines for their defeat are being continually put in operation.

On which account we have this further statement

"And they had slime for mortar;" not, on the contrary, mortar for slime. For the wicked appear to strengthen and fortify what is weak against what is more powerful, and from their own resources to consolidate and preserve what melts and flows away from such things, in order that they may aim and shoot at virtue from a safe place. But the merciful God and father of the good will not permit their buildings to be established in indissoluble safety, their work of melting zeal not being able to withstand, but becoming like soft mud.

For, if their clay had become mortar, then perchance that earthy thing perceptible by the outward senses, which is for ever and ever in a continued state of flux, would have been able to arrive at a safe and unalterable power; but since, on the contrary, their mortar became mere slime, we must not despair, for there is in this, certain hope that the strong fortifications of vice may be overthrown by the might of God.

Therefore the just man, even in the great and incessant deluge of life, while he is not as yet able to see things really as they are by the energy of his soul alone without the assistance of the outward sense, will anoint "the ark," by which I understand the body, "both within and without with pitch," [*] strengthening his imaginations and energies by his own resources; but when the danger has ceased and the violence of the flood abated, then he will come forth, availing himself of his incorporeal mind for the comprehension of truth.