He who truly thinks for himself is like a monarch, in that he recognizes no one over him. His judgements, like the decisions of a monarch, arise directly from his own absolute power. He no more accepts authorities than a monarch does orders, and he acknowledges the validity of nothing he has not himself confirmed.
on The Suffering Of The Worldby arthur Schopenhauer
As the biggest library if it is in disorder is not as useful as a small but well-arranged one, so you may accumulate a vast amount of knowledge but it will be of far less value to you than a much smaller amount if you have not thought it over for yourself.
You can know only what you have thought about.
You can apply yourself voluntarily to reading and learning, but you cannot really apply yourself to thinking: thinking have to be kindled, as a fire is by a draught, and kept going by some kind of interest in its object, which may be an objective interest or merely a subjective one.
Fundamentally it is only our own basic thoughts that possess truth and life, for only these do we really understand through and through. The thoughts of another that we have read are crumbs from another’s table, the cast-off clothes of an unfamiliar guest.
Reading is merely a surrogate for thinking for yourself; it means letting someone else direct your thoughts. Many books, moreover, serve merely to show how many ways there are of being wrong, and how far astray you yourself would go if you followed their guidance.
Our life is to be regarded as a loan received from death, with sleep as the daily interest on this loan.
The nobler and more perfect a thing is, the later and more slowly does it mature.