If you do the same thing over and over again you cannot ever expect a different outcome.

The concept of marriage must have been thought up by an unimaginative pig.

If people are good because they fear punishment, and hope for reward, then we are a sorry lot indeed.

The goal of pacifism is possible only though a supranational organization. To stand unconditionally for this cause is the criterion of true pacifism.

There is a driving force more powerful than steam, electricity and nuclear power: the will.

As soon as science has emerged from its initial stages, theoretical advances are no longer achieved merely by a process of arrangement. Guided by empirical data, the investigator rather develops a system of thought which, in general, is built up logically from a small number of fundamental assumptions, the so-called axioms. We call such a system of thought a theory. The theory finds the justification for its existence in the fact that it correlates a large number of single observations, and it is just here that the 'truth' of the theory lies.

Every day, man is making bigger and better fool-proof things, and every day, nature is making bigger and better fools. So far, I think nature is winning.