The only limit to our realization of tomorrow is our doubts of today.

Escribo para no desaparecer, para dejar una huella en este mundo que todo lo borra.

Suffering! We owe to it all that is good in us, all that gives value to life; we owe to it pity, we owe to it courage, we owe to it all the virtues.

The elements of consciousness are to be determined by systematic observation.

城市记得人们遗忘的事。