I had it phrased to me the other day as : "You may win the battle and lose the War". Not all battles are worth fighting. One has to choose their battle wisely. Once chosen, go forth as a sage and stand strong for what you believe to be right and good for all mankind.
This is a timeless adage from the Art of War by Sun Tzu. A very interesting piece of literature to read or listen to if you haven't yet availed yourself to this.