Do not be afraid of enthusiasm. You need it. You can do nothing effectively without it.
Nothing falsifies history more than logic.
The world belongs to optimists; the pessimists are only spectators.
If I had not smoked I should have been dead ten years ago.
It is only after an unknown number of unrecorded labors, after a host of noble hearts have succumbed in discouragement, convinced that their cause is lost; it is only then that cause triumphs.
The effect of great and inevitable misfortune is to elevate those souls which it does not deprive of all virtue.