Understanding physics is child's play when compared to understanding child's play.

I wouldn't want to live if I did not have my work. In any case, it's good that I'm already old and personally don't have to count on a prolonged future.

We must be prepared to make the same heroic sacrifices for the cause of peace that we make ungrudgingly for the cause of war.

Only strong characters can resist the temptation of superficial analysis.

During the youthful period of mankind's spiritual evolution human fantasy created gods in man's own image, who, by the operations of their will were supposed to determine, or at any rate to influence, the phenomenal world. Man sought to alter the disposition of these gods in his own favour by means of magic and prayer.

I no longer believed in the known God of the Bible, but rather in the mysterious God expressed in nature.

when u knw ur limits u go byond them