Have no respect for the authority of others, for there are always contrary authorities to be found

The desire to understand the world and the desire to reform it are the two great engines of progress, without which human society would stand still or retrogress.

You must believe that you can help bring about a better world.

Hitler is an outcome of Rousseau.

Nothing is so exhausting as indecision, and nothing is so futile.

There is something feeble, and a little contemptible, about a man who cannot face the perils of life without the help of comfortable myths. Almost inevitably some part of him is aware that they are myths and that he believes them only because they are comforting. But he dare not face this thought, and he therefore cannot carry his own reflection to any logical conclusion.

Those who forget good and evil and seek only to know the facts are more likely to achieve good than those who view the world through the distorting medium of their own desires.