Again, if two people lie down together, they can keep warm, but how can one person keep warm?
If one falls, the other can help his friend get up. But how tragic it is for the one who is ⌞all⌟ alone when he falls. There is no one to help him get up.
Though one person may be overpowered by another, two people can resist one opponent. A triple-braided rope is not easily broken.