XII.31#

To those who ask, Where hast thou seen the gods or how dost thou comprehend that they exist and so worshipest them? I answer, in the first place, they may be seen even with the eyes; in the second place, neither have I seen even my own soul and yet I honour it. Thus then with respect to the gods, from what I constantly experience of their power, from this I comprehend that they exist and I venerate them.