Any schoolboy can do experiments in the physics laboratory to test various scientific hypothesis. But man, because he has only one life to live, cannot conduct experiments to test whether to follow his passion or not.

El hombre nunca sabe qué debe querer, porque vive sólo una vida y no tiene modo de compararla con sus vidas precedentes ni de enmendarla con sus vidas posteriores.

لا يُمكن للإنسان أبدًا أن يُدرك ماذا عليه أن يفعل، لأنه لا يملك إلا حياة واحدة، لا يسعه مقارنتها بحيوات سابقة ولا إصلاحها في حيوات لاحقة.

Once more there sounded within me the terrible warning that there is only one life for all men, that there is only one life for all men, that there is no other and that all that can be enjoyed must be enjoyed here. In eternity no other chance will be given to us.

We can never know what to want, because, living only one life, we can neither compare it with our previous lives nor perfect it in our lives to come.

Every man has two lives, and the second starts when he realizes he has just one

Man cannot stand a meaningless life.

[If] a man doesn't have a job or an income, he has neither life nor liberty nor the possibility for the pursuit of happiness. He merely exists.

It is passion that makes man live; wisdom makes one only last.

Life belongs to man, but the meaning of life is beyond him.

Lo que sólo ocurre una vez es como si no ocurriera nunca. Si el hombre sólo puede vivir una vida es como si no viviera en absoluto

A man who won't die for something is not fit to live.

"A man who lives never asks, "What is living?" and he has no theories about living. It is only the half-alive who talk about the purpose of life."

for a man, not having the power of his own life, cannot, by compact, or his own consent, enslave himself to any one,