Vitality shows in not only the ability to persist but the ability to start over.

The difference between the university graduate and the autodidact lies not so much in the extent of knowledge as in the extent of vitality and self-confidence.

When vitality runs high, death takes men by surprise. But if they close their eyes to this possibility, what they gain in peace they lose in sensibility and significance.

Human vitality is so exuberant that in the sorriest desert it still finds a pretext for glowing and trembling.

Nature drives with a loose rein and vitality of any sort can blunder through many a predicament in which reason would despair.