Peter Singer

I think one of the most important directions to be pursued in the 'sciences of human action' is to develop a natural-law ethics based on nature rather than, or at least to supplement, ethics based on theological revelation.

If we live a self-directed, self-motivated, self-centered life, always needing to get our own way, then we're going to be miserable. In fact, many times we believe it's our problems that are making us unhappy when, in reality, it's because we're focused on ourselves!