Mankind

Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying.
Universe (5), Mankind (7)Arthur C. Clarke (1)

We are the only animals that let our kids come back home.
Mankind (7), Children (4), Home (1), Animals (12)Bill Cosby (1)

If you pick up a starving dog and make him prosperous, he will not bite you. This is the principal difference between a dog and a man.
Mankind (7), Animals (12), Dogs (4)Mark Twain (16)

We used to build civilizations. Now we build shopping malls.
Mankind (7), Civilization (2), Malls (1)Bill Bryson (1)

Of all the animals, man is the only one that lies.
Mankind (7), Lies (5), Animals (12)Mark Twain (16)

Man is the only creature that seems to have the time and energy to pump all his sewage out to sea, and then go swimming in it.
Mankind (7), Time (9), Sewage (1)Miles Kington (1)

Mankind must put an end to war, or war will put an end to mankind.
War (9), Mankind (7)John F. Kennedy (1)