"Piensa el sentimiento, siente el pensamiento." (roughly translated, "Think about the emotional and feel the intellectual") - Miguel de Unamuno

In fact, for a voluntarist like Schopenhauer, a theory so sanely and cautiously empirical and rational as that of Darwin, left out of account the inward force, the essential motive, of evolution. For what is, in effect, the hidden force, the ultimate agent, which impels organisms to perpetuate themselves and to fight for their persistence and propagation? Selection, adaptation, heredity, these are only external conditions. This inner, essential force has been called will on the supposition that there exists also in other beings that which we feel in ourselves as a feeling of will, the impulse to be everything, to be others as well as ourselves yet without ceasing to be what we are.

Sólo a solas se sentía él; sólo a solas podía decirse a sí mismo, tal vez para convencerse, ¡yo soy yo!; ante los demás, metido en la muchedumbre atareada o distraída, no se sentía a sí mismo.

What we believe to be the motives of our conduct are usually just the pretexts for it.