For this feeling of wonder shows that you are a philosopher, since wonder is the only beginning of philosophy. - Plato

Wonder is the feeling of a philosopher, and philosophy begins in wonder.

We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.

I do see one large and grievous kind of ignorance, separate from the rest, and as weighty as all the other parts put together. Thinking that one knows a thing when one does not know it. Through this, I believe, all the mistakes of the mind are caused in all of us.

For a poet is an airy thing, winged and holy, and he is not able to make poetry until he becomes inspired and goes out of his mind and his intellect is no longer in him.