Self-interest is the enemy of all true affection.

We have always known that heedless self-interest was bad morals; we now know that it is bad economics.

We have always known that heedless self-interest was bad morals; we know now that it is bad economics

The virtues are lost in self-interest as rivers are lost in the sea.

Deny Self for Self's sake

By self-interest, Man has become gregarious, but in instinct he has remained to a great extent solitary; hence the need of religion and morality to reinforce self-interest