Friedrich Nietzsche said this quote

“ I ascended, I ascended, I dreamt, I thought,—but everything oppressed me. A sick one did I resemble, whom bad torture wearieth, and a worse dream reawakeneth out of his first sleep.—But there is something in me which I call courage: it hath hitherto slain for me every dejection. This courage at last bade me stand still and say: Dwarf! Thou! Or I!—For courage is the best slayer,—courage which attacketh: for in every attack there is sound of triumph.Man, however, is the most courageous animal: thereby hath he overcome every animal. With sound of triumph hath he overcome every pain; human pain, however, is the sorest pain.Courage slayeth also giddiness at abysses: and where doth man not stand at abysses! Is not seeing itself—seeing abysses?Courage is the best slayer: courage slayeth also fellow-suffering. Fellow-suffering, however, is the deepest abyss: as deeply as man looketh into life, so deeply also doth he look into suffering.Courage, however, is the best slayer, courage which attacketh: it slayeth even death itself; for it saith: Was that life? Well! Once more! ”