A braid appears to contain only two strands of hair. But it is impossible to create a braid with only two strands. [ * ] If the two could be put together at all, they would quickly unravel.
Herein lies the mystery: What looks like two strands requires a third. The third strand, though not immediately evident, keeps the strands tightly woven.
In a Christian marriage, God’s presence, like the third strand in a braid, holds husband and wife together.
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[ * ] Actually, you can make a braid with only two strands but they have to be kept under tension or they unravel. (Holwick)