He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.

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

Physicians think they are doing something for you by labeling what you have as a disease

I shall never forget my mother, for it was she who planted and nurtured the first seeds of good within me. She opened my heart to the lasting impressions of nature; she awakened my understanding and extended my horizon and her percepts exerted an everlasting influence upon the course of my life.

Procrastination is hardly more evil than grasping impatience.

If you punish a child for being naughty, and reward him for being good, he will do right merely for the sake of the reward; and when he goes out into the world and finds that goodness is not always rewarded, nor wickedness always punished, he will grow into a man who only thinks about how he may get on in the world, and does right or wrong according as he finds advantage to himself.

All human knowledge begins with intuitions, proceeds from thence to concepts, and ends with ideas.