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. - Dinah Maria Murlock Craik