God is the 3rd strand that strengthens our cord

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9 Two are better than one, because they have a good reward for their toil. 10 For if they fall, one will lift up his fellow. But woe to him who is alone when he falls and has not another to lift him up! 11 Again, if two lie together, they keep warm, but how can one keep warm alone? 12 And though a man might prevail against one who is alone, two will withstand him—a threefold cord is not quickly broken.

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Ecclesiastes 4:9-12 ESV