Two are better than one; because they have a good reward for their labour.
For if they fall, the one will lift up his fellow: but woe to him that is alone when he falleth; for he hath not another to help him up.
And if one prevail against him, two shall withstand him; and a threefold cord is not quickly broken.
For if they fall, the one will lift up his fellow
A threefold cord is not quickly broken
A single strand does have some strength to it. That is why when it is weaved with another it is able to increase its power. But two cords woven as one has more than double the strength of each individually. Similarly, two oxen, when pulling together, are able to carry far more than a double load.
A man alone is in danger of falling to all manner of temptation and self-harm. This is why in addiction recovery they teach individuals to make connections to one another, to be accountable to each other at low times. Once one has a companion in the hard place, the likelihood of a relapse begins to plummet.
The bonding of two souls is one of the most enchanting mysteries I know of. Somehow the two retain perfect individuality, yet also become a single unit. No matter how big a number it is, it can only become greater by addition. Similarly, no matter how strong of an individual you are, you will always be greater with a companion.