Animals, whom we have made our slaves, we do not like to consider our equal.

The explanation of types of structure in classes - as resulting from the will of the Deity, to create animals on certain plans - is no explanation. It has not the character of a physical law and is therefore utterly useless. It foretells nothing because we know nothing of the will of the Deity, how it acts and whether constant or inconstant like that of man.

We consider all our animals to be our kids.

If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.

For slaves to fashion, the rules are made to be broken.

In science, the credit goes to the man who convinces the world, not to whom the idea first occurs.