Gen 2.4-17: God places a man in a beautiful garden to work it and keep it, and then gives him a command that is for his good.
Gen 2.18: With all that God gave him to do, man’s problem is being alone.
Gen 2.19-25: God solves the problem by giving him a perfect companion.
Marriage is God’s solution to mankind’s biggest problem. You could really boil sin down to mankind trying to be alone. Adam and Eve sinned because they did not help each other obey God. Eve acted alone. God gives His people commands, and when they disobey they are acting independent of their Maker. They are acting alone. Even when two people commit sexual immorality, it is two people acting selfishly. They are acting alone. Sin is mankind trying to be alone. God’s solution to man’s alone-ness is marriage. God’s solution to mankind’s sin is marriage– between Christ and his bride.