It is good to be children sometimes, and never better than at Christmas, when its mighty Founder was a child Himself. A Christmas Carol

What good men most biologists are, the tenors of the scientific world — temperamental, moody, lecherous, loud-laughing, and healthy. Your true biologist will sing you a song as loud and off-key as will a blacksmith, for he knows that morals are too often diagnostic of prostatitis and stomach ulcers. Sometimes he may proliferate a little too much in all directions, but he is as easy to kill as any other organism, and meanwhile he is very good company, and at least he does not confuse a low hormone productivity with moral ethics. The Log from the sea of Cortez

In some mysterious way, once one has gained an insight into human nature, that insight grows from day to day, and he to whom it has given to experience vicariously even one single form of earthly suffering acquires, by reason of this tragic lesson, an understanding of all its forms, even those most foreign to him, and apparently abnormal. Beware of Pity

Where have they gone, the brilliant, the insightful ones, the proud? Book VIII