Possibility (n.) is where evil will and inertia go to hide from definite obligations.
Possibility (n.) multiplies the less a man knows of how things actually hang together — witness the pub politician.
Possibility (n.) looks richer than actuality but is poorer — which is why even common sense calls it "merely" possible.
Possibility (n.) asks only that a thing not contradict itself — so everything is possible, and by the same token everything is impossible.
Possibility (n.) is cheap: tear the moon from its relations and it may fall on the earth tonight; the Sultan, being a man, may become Pope.
Possibility (n.) understood as mere non-contradiction lets in nearly anything: the moon might drop onto the earth tonight, the Turkish sultan might be made Pope.
Possibility (n.) that is real is judged against a background of the actual: the possibility of A is itself a reality, the state of affairs that holds A latent within it.