And if one prevail against him, two shall withstand him; and a threefold cord is not quickly broken. Ecclesiastes 4:12 (KJV)
This is the third metaphor for comfort that Qoheleth positions against the self-centred achiever. This is perhaps the isolated man’s greatest loss: the comfort of divine communion with other Saints, and Christ. On the subject of ‘prevailing’ through the travails of life (or spiritual warfare), the loner is vulnerable. There is much to lose. And the probability of winning is too little. But the one in a divine communion, has other believers, elects, saints, faithing along him. This is a situation where both are conquerors: why? Because they are strengthened by a third cord, i.e., the Holy Spirit. (Henry) So, as opposed to the ambition of the selfish loner, Qoheleth suggests it is better to rest in the Sovereign will of YHWH, in the community of His people, in the care of His Holy Spirit.
Reference:
Henry, M. (1706). Commentary on the Whole Bible, Complete, Eccl. 4:1-12