“To cheapen the lives of any group of men, cheapens the lives of all men, even our own. This is a law of human psychology, or human nature. And it will not be repealed by our wishes, nor will it be merciful to our blindness.”

“We all are men, in our own natures frail, and capable of our flesh; few are angels.”

“It is not the ought-ness of the problem that we have to consider, but the is-ness!”

“Understanding human nature must be the basis of any real improvement in human life. Science has done wonders in mastering the laws of the physical world, but our own nature is much less understood, as yet, than the nature of stars and electrons. When science learns to understand human nature, it will be able to bring a happiness into our lives which machines and the physical sciences have failed to create.”

“The greatest revolution of our generation is the discovery that human beings by changing the inner attitudes of their minds, can change the outer aspects of their lives”

“Selfishness is one of the principal fruits of the corruption of human nature; and it is obvious that selfishness disposes us to over-rate our good qualities, and to overlook or extenuate our defects.”

“When a tender affection has been storing itself in us through many of our years, the idea that we could accept any exchange for it seems to be a cheapening of our lives. And we can set a watch over our affections and our constancy as we can over other treasures.”