According to Sigmund Freud, there are only two basic drives that serve to motivate all thoughts, emotions, and behavior. These two drives are, simply put, sex and aggression. Also called Eros and Thanatos, or life and death, respectively, they underlie every motivation we as humans experience.
For me, sex drive is strong and creates motivation. And aggression is largely suppressed and short lived. Though, I can't say for sure what rules the world. I always cheer for love, though.
But, you know, Freud is actually pseudoscientific.