Nothing is worth more than this day. You cannot relive yesterday. Tomorrow is still beyond your reach.

The Primal Plant is going be the strangest creature in the world, which Nature herself must envy me. With this model and the key to it, it will be possible to go on for ever inventing plants and know that their existence is logical; that is to say, if they do not actually exist, they could, for they are not the shadowy phantoms of a vain imagination, but possess an inner necessity and truth. The same law will be applicable to all other living organisms.

The most damaging prejudice consists of banning any kind of investigation of nature.

The style of an author is a faithful copy of his mind.

So long as you live and work, you will be misunderstood; to that you must resign yourself once and for all. Be silent!

Treat people the way they are and they will stay that way. Treat people the way they can become and they will become that way.

I do not know myself, and God forbid that I should.