All for one and one for all. A friend in need is a friend indeed. It is impossible for a leopard to change its spots. Hitch your wagon to a star. If wishes were horses, then all beggars would ride.
Nothing comes of nothing.
Rome wasn't built in one day. The proof of the pudding is in the eating. There's more than one way to skin a cat. Truth is stranger than fiction. Don't get your nose out of joint.