Love is the child of illusion and the parent of disillusion.

Miguel de Unamuno

A fool bolts pleasure, then complains of moral indigestion.

Miguel de Unamuno

It is sad not to love, but it is much sadder not to be able to love.

Miguel de Unamuno

The skeptic does not mean him who doubts, but him who investigates or researches, as opposed to him who asserts and thinks that he has found.

Miguel de Unamuno