From episode 5 of Cosmos, Blues for a Red Planet

I’m a collection of organic molecules called Carl Sagan. You’re a collection of almost identical molecules with a different collective label. But is that all? Is there nothing inhere but molecules? Some people find that idea somehow demeaning to human dignity, but for myself I find it elevating and exhilerating to discover that we live in a universe which permits the evolution of molecular machines as intricate and subtle as we.

The beauty of a living thing is not the atoms that go into it, but the way those atoms are put together.

Carl Sagan (1934–1996)
Astronomer, astrophysicist, cosmologist, author, and popularizer of science