Three are even better ...
Three are even better, for a triple-braided cord is not easily broken. -Ecclesiastes 4:12
This verse is one of the most often quoted at wedding ceremonies because of the way that it symbolizes the marital covenant. In that context I see several relationships. First I think that there is the covenant that the couple makes to each other before God when they say the words in sickness and in health, in good times and bad, for richer or poor, till death do us part. This I think is the essence of covenant - it is greater than a contract because God is involved.
The other aspect of this covenantal relationship is the one that the couple has with God. No longer is the relationship with God all about a personal interaction - the two have become one yet so very often the two act like this covenant does not exist. It is so difficult to walk out because of pride - it is hard defer to how the other is led by God. And it is so often difficult to hear from God together about life issues. Yet it is possible - three are even better than two.
Dear Lord, please bring humility into our marriages. Help us to seek you and hear your voice together.