34 Whence, therefore, have these vicious opinions flowed, or from what causes have they sprung? From this it is clear, in great measure, that men are unable to know what God is, what is His essence, nature, substance, quality; whether He has a form, or is limited by no bodily outline, does anything or not, is ever watchful, or is at times sunk in slumbers, runs, sits, walks, or is free from such motions and inactivity. Being, as I have said, unable to know all these things, or to discern them by any power of reason, they fell into these fanciful beliefs, so that they fashioned gods after themselves, and gave to these such a nature as they have themselves, in actions, circumstances, and desires.
But if they were to perceive that they are worthless creatures, and that there is no great difference between themselves and a little ant, they would cease, indeed, to think that they have anything in common with the gods of heaven, and would confine their unassuming insignificance within its proper limits. But now, because they see that they themselves have faces, eyes, heads, cheeks, ears, noses, and all the other parts of our limbs and muscles, they think that the gods also have been formed in the same way, that the divine nature is embodied in a human frame; and because they perceive that they themselves rejoice and are glad, and again are made sad by what is too disagreeable, they think that the deities also on joyous occasions are glad, and on less pleasant ones become dejected.
They see that they are affected by the games, and think that the minds of the celestials are soothed by enjoying games; and because they have pleasure in refreshing themselves with warm baths, they think that the cleanness produced by bathing is pleasing to the gods above. We men gather our vintages, and they think and believe that the gods gather and bring in their grapes; we have birthdays, and they affirm that the powers of heaven have birthdays. But if they could ascribe to the gods ill-health, sickness, and bodily disease, they would not hesitate to say that they were splenetic, blear-eyed, and ruptured, because they are themselves both splenetic, and often blear-eyed, and weighed down by huge hernice.
Source: Against the Heathen (New Advent)