„No one thought up being. He who thinks he has, step forward.“

— Jim Morrison

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„They are made for life, not for thought. Yes, and he who thinks, what's more, he who makes thought his business, he may go far in it, but he has bartered the solid earth for the water all the same, and one day he will drown.“
— Hermann Hesse
„Does man think because he has found that thinking pays?Does he bring his children up because he has found it pays?“
— Ludwig Wittgenstein
„Success treads on every right step. For the instinct is sure, that prompts him to tell his brother what he thinks. He then learns, that in going down into the secrets of his own mind, he has descended into the secrets of all minds. He learns that he who has mastered any law in his private thoughts, is master to that extent of all men whose language he speaks, and of all into whose language his own can be translated.“
— Ralph Waldo Emerson
„He who thinks half-heartedly will not believe in God; but he who really thinks has to believe in God.“
— Isaac Newton
„he who thinks great thoughts often makes great errors“
— Martin Heidegger
„(final lines) I will write about all of this one day, he thinks, and knows it's just a dawn thought, an after-dreaming thought. But it's nice to think so for a while in the morning's clean silence, to think that childhood has its own sweet secrets and confirms mortality, and that mortality defines all courage and love. To think that what has looked forward must also look back, and that each life makes its own imitation of immortality: a wheel.Or so Bill Denbrough sometimes thinks on those early mornings after dreaming, when he almost remembers his childhood, and the friends with whom he shared it.“
— Stephen King
„One day when Pooh was thinking, he thought he would go and see Eeyore, because he hadn't seen him since yesterday.“
— A.A. Milne