I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself.
David Herbert Lawrence
Intelligence without ambition is a bird without wings.
It may be hard for an egg to turn into a bird: it would be a jolly sight harder for it to learn to fly while remaining an egg. We are like eggs at present. And you cannot go on indefinitely being just an ordinary, decent egg. We must be hatched or go bad.
C. S. Lewis
Just as there are predatory birds, so there are predatory ideas
Poetry is like a bird, it ignores all frontiers.