This is not a quote, but a thought that I heard recently- God created the two sexes so that people would realize that they are not sufficient alone. Adam and Eve were created to perfectly complement each other. Each showed a part of God's character, but it wasn't the fullness of it- the two need to be brought together to make one. ONLY God is sufficient in Himself. People need the balance of the sexes. It takes a little bit to think through, but it makes sense! Sometimes it takes work, but we really can bring out the best in each other if we work at it. We need each other to bring out the best of the godly masculinity and femininity that is within us.