A strong idiot, doesn't know what to do with his strength, therefore rendering him weak. A hammer without an owner is useless, as it cannot do anything without a brain, even though it can hammer nails. This is very, very, true. Think about it. You could have all the strength in the world, but without a brain, you would be dead.
The reason i think that brains are more important than brawn is because without smart people we wouldn't have been able to further the human race whatsoever. If all we had were people with "brawns" then we would still be down to our most basic primal instincts trying to survive.