Civilizations can only be understood by those who are civilized.

The paradox is now fully established that the utmost abstractions are the true weapons with which to control our thought of concrete fact.

One main factor in the upward trend of animal life has been the power of wandering.

Without deductive logic science would be entirely useless. It is merely a barren game to ascend from the particular to the general, unless afterwards we can reverse the process and descend from the general to the particular, ascending and descending like angels on Jacob's ladder.

To be an abstraction does not mean that an entity is nothing. It merely means that its existence is only a factor of a more concrete element of nature.

Knowledge shrinks as wisdom grows.

Religion is what a person does in his solitariness.