The human soul is very much older than the human mind.

The rushed existence into which industrialized, commercialized man has precipitated himself is actually a good example of an inexpedient development caused entirely by competition between members of the same species. Human beings of today are attacked by so-called manager diseases, high blood pressure, renal atrophy, gastric ulcers, and torturing neuroses: they succumb to barbarism because they have no more time for cultural interests.

Most people have forgotten how to live with living creatures, with living systems and that, in turn, is the reason why man, whenever he comes into contact with nature, threatens to kill the natural system in which and from which he live.

We had better dispense with the personification of evil, because it leads, all too easily, to the most dangerous kind of war: religious war.

Truth in science can be defined as the working hypothesis best suited to open the way to the next better one.

We do not take humor seriously enough.

More than any other product of human scientific culture scientific knowledge is the collective property of all mankind.