If a man is often the subject of conversation he soon becomes the subject of criticism.

We can judge the heart of a man by his treatment of animals.

The more we come in contact with animals and observe their behaviour, the more we love them, for we see how great is their care of the young.

Philosophy stands in need of a science which shall determine the possibility, principles, and extent of human knowledge à priori.

[S]uppose the mind of [a] friend of humanity were clouded over with his own grief, extinguishing all sympathetic participation in the fate of others; he still has the resources to be beneficent to those suffering distress, but the distress of others does not touch him because he is sufficiently busy with his own; and now, where no inclination any longer stimulates him to it, he tears himself out of his deadly insensibility and does the action without any inclination, solely from duty.

I am myself by inclination an investigator.

Apart from moral conduct, all that man thinks himself able to do in order to become acceptable to God is mere superstition and religious folly.