This quote is written / told by Gary Larson somewhere between August 14, 1950 and today. He/she was a famous Cartoonist from USA.
The author also have 5 other quotes.
"Life is life - whether in a cat, or dog or man. There is no difference there between a cat or a man. The idea of difference is a human conception for man's own advantage"
"The man who makes everything that leads to happiness depends upon himself, and not upon other men, has adopted the very best plan for living happily. This is the man of moderation, the man of manly character and of wisdom"