All growth is a leap in the dark, an act without the benefit of experience.
— Henry Miller
It is by extending oneself, by exercising some capacity previously unused that you come to a better knowledge of your own potential.
— Harold Bloom
God never puts anyone in a place too small to grow.
Undertake something that is difficult; it will do you good. Unless you try to do something beyond what you have already mastered, you will never grow.
— Ronald Osborn