God had a purpose in placing man alone in that garden, for a period of time. It was to show him that he had a need, that he needed someone to be with him. Here he defines her as "a suitable helper". This was necessary to carry out the purpose of God who, as we have seen in chapter 1:28, wanted man and woman to be fruitful, to multiply and submit to the earth. This explains the phrase in verse 18, which says, "It is not good for a man to be alone." And then he says that he will provide "a suitable help". That is, someone with whom to dialogue and agree, with whom to have affinity, someone who complements him, that is, his other party. It is as if a man were an incomplete part, until he joins in marriage with a woman. This is an important consideration to keep in mind and it is God's purpose for man and woman.