“Then the LORD God said, ‘It is not good for the man to be alone; I will make him a helper suitable for him.'” -Genesis 2:18
God’s creative work was not complete until He made woman. He could have made her from the dust of the ground, as He made man. God chose, however, to make her from the man’s flesh and bone. In doing so, He illustrated for us that in marriage man and woman symbolically are united into one. The goal of marriage should be more than friendship; it should be oneness.
Via: NLT Life Application Study Bible