Ecclesiastes 4:9-12

9 Two are better than one, because they have a good reward for their labor.  10 For if they fall, the one will lift up his fellow; but woe to him who is alone when he falls, and doesn't have another to lift him up.  11 Again, if two lie together, then they have warmth; but how can one keep warm alone?  12 If a man prevails against one who is alone, two shall withstand him; and a threefold cord is not quickly broken.