An email from a friend contained this quote in his signature:
Despite its artistic pretensions, its sophistication, and its many accomplishments, humankind owes its existence to a six-inch layer of topsoil and the fact that it rains.
I googled the quote and found this site which featured the following quote by Siggy Freud:
The first human who hurled an insult instead of a stone was the founder of civilization.
And now we’ve learned to combine both. Real progress : )