Probably there is an imperceptible touch of something permanent that one feels instinctively to adhere to true humour, whereas wit may be the mere conversational shooting up of "smartness"--a bright feather, to be blown into space the second after it is launched...Wit seems to be counted a very poor relation to Humour....Humour is never artificial.

I am not interested to know whether vivisection produces results that are profitable to the human race or doesn't...The pain which it inflicts upon unconsenting animals is the basis of my enmity toward it, and it is to me sufficient justification of the enmity without looking further.

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!

I believe I have no prejudices whatsoever. All I need to know is that a man is a member of the human race. That's bad enough for me.

A wanton waste of projectiles.

Well enough for old folks to rise early, because they have done so many mean things all their lives they can't sleep anyhow.

I am not given to exaggeration, and when I say a thing I mean it.