He that will not when he may, when he will he shall have nay proverbial saying, late 10th century, meaning that if an opportunity is not taken when offered, it may well not occur again.
he who wills the end, wills the means proverbial saying, late 17th century, meaning that someone sufficiently determined upon an outcome will also be ready to accept whatever is necessary to achieve it. (Compare where there's a will, there's a way at will1.)
will the real — please stand up? catchphrase from an American TV game show (1955–66) in which a panel was asked to identify the ‘real’ one of three candidates all claiming to be a particular person; after the guesses were made, the compère would request the ‘real’ candidate to stand up.