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This lyric concedes that life is erratic. In any case, Don't Stop likewise brings up that, all the time, it's when things look most depressing that we're near a leap forward. So you need to continue onward, in light of the fact that you could be simply steps from progress and not know it.
There will be individuals who disclose to you that you can't. There will be times when you sense that you've gotten kept running over by an armada of trucks. In any case, it's you who is "the ace of [your] soul". You have a decision about how to carry on, what to do and who to turn into. Nobody can take that from you. For the acknowledgment of and gratefulness for a warrior soul, and for the staunch accentuation on both moral obligation and fearlessness, Invictus reliably positions as the most uplifting lyric ever.