Lincoln isn't simply urging courage in the face of long odds—he's making a logical argument that probability shouldn't govern our sense of obligation. Notice the precision: he doesn't say the cause *will* succeed or that faith will move mountains, only that failure's likelihood shouldn't sway our moral compass. This distinction matters because it frees us from the trap of requiring guaranteed outcomes before we act, a particularly useful insight for anyone supporting unpopular reforms, from a parent advocating for a struggling child's needs within an indifferent school system to a whistleblower knowing their disclosure may change nothing. The quote's power lies in its cool-headed insistence that righteousness and probability are separate currencies entirely.