Rules for happiness: something to do, someone to love, something to hope for.

Two things fill the mind with ever-increasing wonder and awe, the more often and the more intensely the mind of thought is drawn to them: the starry heavens above me and the moral law within me.

Con las piedras que con duro intento los críticos te lanzan, bien puedes erigirte un monumento.

An action, to have moral worth, must be done from duty.

In law a man is guilty when he violates the rights of others. In ethics he is guilty if he only thinks of doing so.

Look closely. The beautiful may be small.

Always recognize that human individuals are ends, and do not use them as means to your end.