I could never have known so well how paltry men are, and how little they care for really high aims, if I had not tested them by my scientific researches. Thus I saw that most men only care for science so far as they get a living by it, and that they worship even error when it affords them a subsistence.

But who will dare to speak the truth out clear? The few who anything of truth have learned, And foolishly did not keep truth concealed, Their thoughts and visions to the common herd revealed, Since time began we've crucified and burned

You can’t, if you can’t feel it, if it never Rises from the soul, and sways The heart of every single hearer, With deepest power, in simple ways. You’ll sit forever, gluing things together, Cooking up a stew from other’s scraps, Blowing on a miserable fire, Made from your heap of dying ash. Let apes and children praise your art, If their admiration’s to your taste, But you’ll never speak from heart to heart, Unless it rises up from your heart’s space.

Always to distrust is an error, as well as always to trust.

If you are convinced of a matter, you must take sides or you don't deserve to succeed.

One lives but once in the world.

There are two things parents should give their children roots and wings. Roots to give them bearing and a sense of belonging, but also wings to help free them from constraints and prejudices and give them other ways to travel (or rather, to fly).