The only two questions, at any moment of choice in life, is what the price is, and whether or not it's worth paying. - Oliver Burkeman

Rate your individual acts as good or bad, if you like. Seek to perform as many good ones, and as few bad ones, as possible.

Healthy and happy people, research suggests, generally have a less accurate, overly optimistic grasp of their true ability to influence events than do those who are suffering from depression.

our judgments about the world are all that we can control, but also all that we need to control in order to be happy; tranquility results from replacing our irrational judgments with rational ones.