If we knew all the laws of Nature, we should need only fact, or the description of one actual phenomenon, to infer all the particular results at that point.

There is not so good an understanding between any two, but the exposure by the one of a serious fault in the other will produce a misunderstanding in proportion to its heinousness.

The tree of Knowledge is a Tree of Knowledge of good and evil.

While my friend was my friend, he flattered me, and I never heard the truth from him. When he became my enemy, he shot it to me on a poisoned arrow.

The life of a wise man is most of all extemporaneous, for he lives out of an eternity which includes all time.

The natural historian is not a fisherman who prays for cloudy days and good luck merely; but as fishing has been styled "a contemplative man's recreation," introducing him profitably to woods and water, so the fruit of the naturalist's observations is not in new genera or species, but in new contemplations still, and science is only a more contemplative man's recreation.

Truth is always paradoxical.