"Beasts find out where their talents lie:
A bear will not attempt to fly
A founder'd horse will oft debate,
Before he tries a five-barred gate;
A dog by instinct turns aside,
Who sees the ditch too deep and wide;
But men we find the only creature
who, led by folly, combats nature;
Who when she loudly cries - forbear,
With obstinacy fixes there;
and, where his genius least inclines,
Absurdly bends his whole designs." 

Jonathan Swift.