Physics is an attempt conceptually to grasp reality as something that is considered to be independent of its being observed. In this sense one speaks of physical reality.

Laws alone can not secure freedom of expression; in order that every man present his views without penalty there must be spirit of tolerance in the entire population.

Everything you can imagine, nature has already created.

The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.

Problems cannot be solved by thinking within the framework in which the problems were created.

Though our conduct seems so very different from that of the higher animals, the primary instincts are much alike in them and in us.

Even though the realms of religion and science in themselves are clearly marked off from each other, nevertheless there exist between the two strong reciprocal relationships and dependencies.