Then I returned, and I saw vanity under the sun [in one of its peculiar forms]. Here is one alone -- "no one with him; he neither has child nor brother. Yet there is no end to all his labor, neither is his eye satisfied with riches, neither does he ask, For whom do I labor and deprive myself of good? This is also vanity (emptiness, falsity, and futility); yes, it is a painful effort and an unhappy business. Two are better than one, because they have a good [more satisfying] reward for their labor; read more.
For if they fall, the one will lift up his fellow. But woe to him who is alone when he falls and has not another to lift him up! Again, if two lie down together, then they have warmth; but how can one be warm alone? And though a man might prevail against him who is alone, two will withstand him. A threefold cord is not quickly broken.

Friendship » General references to » Profitable

Ecclesiastes 4:9-10

Union » Advantages of

Proverbs 15:22

Without consultation and wise advice, plans are frustrated,
But with many counselors they are established and succeed.

Ecclesiastes 4:9-12

Two are better than one, because they have a good [more satisfying] reward for their labor; For if they fall, the one will lift up his fellow. But woe to him who is alone when he falls and has not another to lift him up! Again, if two lie down together, then they have warmth; but how can one be warm alone? read more.
And though a man might prevail against him who is alone, two will withstand him. A threefold cord is not quickly broken.