“If we look at certain proteins, yes, man then -- it can be assumed that man is more closely related to a chimpanzee than other things. But on the other hand, if you look at other certain proteins, you'll find that man is more closely related to a bullfrog than he is a chimpanzee. If you focus your attention on other proteins, you'll find that man is more closely related to a chicken than he is to a chimpanzee.”

Source: Nietzsche: Philosopher, Psychologist, Antichrist (1951), p. 151
Context: There is thus a certain plausibility to Nietzsche's doctrine, though it is dynamite. He maintains in effect that the gulf separating Plato from the average man is greater than the cleft between the average man and a chimpanzee.

Source: 1860s, Evidence as to Man's Place in Nature (1863), Ch.2, p. 120

As quoted in "Man må tro at det nytter" http://www.bt.no/nyheter/--Man-ma-tro-at-det-nytter-2633333.html (31 December 2011), by Erik Fossen and Håvard Bjelland, BT (in Norwegian)
2010s

Book I, Chapter 5, "We Have Cause to Be Uneasy"
Mere Christianity (1952)
Context: We have two bits of evidence about the Somebody. One is the universe He has made. If we used that as our only clue, I think we should have to conclude that He was a great artist (for the universe is a very beautiful place), but also that He is quite merciless and no friend to man (for the universe is a very dangerous and terrifying place.)... The other bit of evidence is that Moral Law which He has put in our minds. And this is a better bit of evidence than the other, because it is inside information. You find out more about God from the Moral Law than from the universe in general just as you find out more about a man by listening to his conversation than by looking at a house he has built.

Source: The Tattoo Artist

So I'm denying that I'm a man.
Attributed

Of Ceremonies and Respect
Essays (1625)
Variant: Wise men make more opportunities than they find.
Source: The Essays