We all know strength so strong as to be weaker than weakness and weakness so great as to be stronger than strength.
 Samuel Butler, The Note-Books of Samuel Butler (1912). copy citation

Context

“The meeting of extremes is never clearer than in the case of moral and intellectual strength and weakness. We may say with Hesiod “How much the half is greater than the whole!” or with S. Paul “My strength is made perfect in weakness”; they come to much the same thing. We all know strength so strong as to be weaker than weakness and weakness so great as to be stronger than strength. iv The Queen travels as the Countess of Balmoral and would probably be very glad, if she could, to travel as plain Mrs. Smith. There is a good deal of the Queen lurking in every Mrs. Smith and, conversely, a good deal of Mrs.” source