Never abandon a theory that explains something until you have a theory that explains more.
John McCarthyI was on the mathematics faculty at M.I.T. from 1951 through until I resigned in the spring of 1959.
John Forbes Nash, Jr.The energy and daring is to resist the noes, until the final yes has been achieved.
Jeffrey D. SachsWe don't know what we're writing until it just comes out. We don't sit around crunching numbers.
Dustin DiamondMen will never be free until the last king is strangled with the entrails of the last priest.
Denis Diderot