A religion contradicting science and a science contradicting religion are equally false.

I have become so accustomed to think "scientifically" that I am afraid even to imagine that there may be something else beyond the outer covering of life. I feel like a man condemned to death, whose companions have been hanged and who has already become reconciled to the thought that the same fate awaits him.

People live in sleep, do everything in sleep, and do not know they are asleep.

Philosophy is based on speculation, on logic, on thought, on the synthesis of what we know and on the analysis of what we do not know. Philosophy must include within its confines the whole content of science, religion and art.

It is by overcoming obstacles that man develops those qualities he needs.

Our ancestors were very rich and eminent people, and they left us an enormous inheritance, which we have completely forgotten, especially since the time when we began to consider ourselves the descendants of a monkey.

Psychology is sometimes called a new science. This is quite wrong. Psychology is, perhaps, the oldest science, and, unfortunately, in its most essential features a forgotten science.