"Two are better than one, Because they have a good reward for their labor." Ecclesiastes 4:9 NKJV
It is essential to look at the passage (v. 9-12) for this verse to make sense. The scriptures talk about unity with others, whether a spouse, friend or someone else. We were created to be in communion with God and each other. We see this from the opening pages of the Bible, "And the Lord God said, 'It is not good that man should be alone; I will make him a helper comparable to him.'" (Gen 2:18)
The passage continues listing some practical reasons for this, to help each other up when we fall, to keep warm, and for protection. Then, in verse 12, we also read this last line, "And a threefold cord is not quickly broken." For this reference to make sense, we need to talk about rope. A rope is made up of individual strands of fiber. Each strand is only as strong as the fabric, but if we wind the individual strands together, we end up with a stronger cord. So if the two people each represent one strand, what is the third strand? The Holy Spirit.
Adding more strands to your rope is possible, but the Holy Spirit must always be present to bind us together. Without its existence, our rope begins to fray and separate. Firmly wound together, though, we can accomplish more things for the glory of God.
God, thank you for binding us together in your Spirit. May we not allow discord to fray our cord. Bless all we do for your greater glory. We pray this in Jesus' name. Amen.