Meditation 12.28

28. To those who ask the question: 'Where have you seen the gods, or whence have you apprehended that they exist, that you thus worship them?' First, they are visible even to the eyes; secondly, I have not seen my own soul and yet I honour it; and so, too, with the gods, from my experiences every instant of their power, from these I apprehend that they exist and I do them reverence.