cruelty to animals is contrary to man's duty to himself, because it deadens in him the feeling of sympathy for their sufferings, and thus a natural tendency that is very useful to morality in relation to other human beings is weakened.

Man desired concord; but nature knows better what is good for his species; she desires discord. Man wants to live easy and content; but nature compels him to leave ease... and throw himself into roils and labors.

Animals... are there merely as a means to an end. That end is man.

The science of mathematics presents the most brilliant example of how pure reason may successfully enlarge its domain without the aid of experience

A science of all these possible kinds of space [the higher dimensional ones] would undoubtedly be the highest enterprise which a finite understanding could undertake in the field of geometry... If it is possible that there could be regions with other dimensions, it is very likely that God has somewhere brought them into being.

You only know me as you see me, not as I actually am

Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck.