Those who are really convinced that they have made progress in science would not demand freedom for the new views to continue side by side with the old, but the substitution of the new views for the old.

Do you want to spend the rest of your life selling sugared water or do you want a chance to change the world?

The philosophers have only interpreted the world, in various ways: the point, however, is to change it.

If you want to make the world a better place, take a look at yourself, and make a change.

You must be the change you wish to see in the world.

Our greatest ability as humans is not to change the world; but to change ourselves.