As, therefore, the seeds and plants which are put into the ground grow and blossom through being irrigated, and are thus made fertile for the production of fruits, but if they are deprived of moisture they wither away, so likewise the soul, as it appears when it is watered with the wholesome stream of Wisdom, shoots forth, and brings fruit to perfection….
On which account it is said in Genesis, “And a fountain went up from the earth, and watered all the face of the Earth” (Gen. 2:6).… In this way in truth, it is that the Logos of God irrigates the virtues; for that is the beginning and the fountain of all good actions…. For there are four generic virtues: prudence, courage, self-control, and justice. And of these, every single one is a princess and a ruler; and he who has acquired them is, from the moment of the acquisition, a ruler and a king, even if he or she has no abundance of any kind of treasure.
-Philo of Alexandria (1st century)