It is not worth while to strain one's self to tell the truth to people who habitually discount everything you tell them, whether it is true or isn't.

I've come loaded with statistics, for I've noticed that a man can't prove anything without statistics. No man can.

Medicine has made all its progress during the past fifty years. ... How many operations that are now in use were known fifty years ago?-they were not operations, they were executions.

Have a place for everything and keep the thing somewhere else. This is not advice, it is merely custom.

I'm in favor of progress; it's change I don't like.

In the laboratory there are no fustian ranks, no brummagem aristocracies; the domain of Science is a republic, and all its citizens are brothers and equals, its princes of Monaco and its stonemasons of Cromarty meeting, barren of man-made gauds and meretricious decorations, upon the one majestic level!

You can't keep a juvenile moral institution alive on two displays of its sash per year.