Ellipsis of where there is a will there is a way.

If someone wants or wills something strongly enough, a way can be found to make it happen.

(colloquial, often humorous, rhetorical question) Used as a response to a question such as "How long will it take?" or "How big is it?" when the length or size is unknown, infinite, variable, or relative.

Humans prey upon one another.

One can never be sure of one's paternity.

Alternative form of a penny saved is a penny earned

Alternative form of a camel is a horse designed by a committee

(Internet slang) The end being pursued is unattainable or misguided; the reward promised is false.

(idiomatic) In politics, a lot of change can happen in a short space of time.

Third-person singular simple present indicative form of be a thing