Though it is folly to suppose that happiness is a matter of volition, and that we can make ourselves content and cheerful whenever we choose — a theory that many poor hypochondriacs are taunted with till they are nigh driven mad — yet, on the other hand, no sane mind is ever left without the power of self-discipline and self-control in a measure, which measure increases in proportion as it is exercised.
Ch. 10 - A Woman's Thoughts About Women (1858)