Think of your many years of procrastination; how the gods have repeatedly granted you further periods of grace, of which you have taken no advantage. It is time now to realise the nature of the universe to which you belong, and of that controlling Power whose offspring you are; and to understand that your time has a limit set to it. Use it, then, to advance your enlightenment; or it will be gone, and never in your power again.

A philosopher knows that in reality he knows very little. That is why he constantly strives to achieve true insight. Socrates was one of these rare people. He knew that he knew nothing about life and about the world. And now comes the important part: it troubled him that he knew so little.

Life continues even if no one has proven to us the shape and size of the Earth, even if no one has informed us about the composition of air and the depth of sky.
We will not float in weightlessness simply because we have not read the lesson on gravity.

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