It almost seems to me that man was not born to be a carnivore.

Persistence is the most powerful force on earth, it can move mountains.

Knowledge exists in two forms - lifeless, stored in books, and alive, in the consciousness of men. The second form of existence is after all the essential one; the first, indispensable as it may be, occupies only an inferior position.

If the bee disappeared off the surface of the globe, then man would have only four years of life left. No more bees, no more pollination, no more plants, no more animals, no more man.

But nature did not deem it her business to make the discovery of her laws easy for us.

Whether or not you can observe a thing depends upon the theory you use. It is the theory which decides what can be observed.

The state is made for man, not man for the state.... That is to say, the state should be our servant and not we its slaves