Skilled use of logic, disputation, and the developed ability to name things correctly are some of the instruments philosophy gives us to achieve abiding clear-sightedness and inner tranquility, which is true happiness.

Epictetus. The art of living: the classic manual on virtue, happiness, and effectiveness, a new interpretation by Sharon Lebell. HarperSanFrancisco, 1995, p. 84.

Contra Andrew Bird and Mark. Well, maybe it is more explanatory than contrary to me. Hmmm…. Philosophy, properly applied, is a wonderful thing.