We don’t like it when someone else wants to eat our lunch, but without them, we wouldn’t be very good.
“He that wrestles with us strengthens our nerves and sharpens our skill. our antagonist is our helper.” – Edmund Burke
“If there be no enemy there’s no fight. If no fight, no victory, and if no victory there is no crown.” – Thomas Carlyle
“Pay attention to your enemies, for they are the first to discover your mistakes.” – Antisthene