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; because only through ordering what you know by comparing every truth with every other truth can you take complete possession of your knowledge and get it into your power. You can think about only what you know, so you ought to learn something; on the other hand, you can know only what you have thought about.

Most men are so thoroughly subjective that nothing really interests them but themselves.

Animals learn death first at the moment of death;...man approaches death with the knowledge it is closer every hour, and this creates a feeling of uncertainty over his life, even for him who forgets in the business of life that annihilation is awaiting him. It is for this reason chiefly that we have philosophy and religion.

The world is my representation

The scenes and events of long ago, and the persons who took part in them, wear a charming aspect to the eye of memory, which sees only the outlines and takes no note of disagreeable details. The present enjoys no such advantage, and so it always seems defective.

What makes people hard-hearted is this, that each man has, or fancies he has, as much as he can bear in his own troubles.

That which knows all things and is known by none is the subject.