A consideration of our human participation in the divine creativity can be regarded as a legitimate, indeed desirable appendix or coda to the theology of creation. It is essentially a consideration of the relationship between creature and creator, of the active relationship indeed of creatures, that is of ourselves, with God. A look at God’s active relationship with us, at what the creator does with and for his creatures, means reflection on God’s providence and on his government of his creation. A look at our active relationship with God, at what we as creatures do for the creator, means reflection on our ability and our need to know and glorify God.
But the question immediately arises whether it makes sense to talk about creatures doing anything for the creator; and it is answered by the very firm assertion that God has absolutely no need of his creation at all. We, all creatures, owe him everything, he has no need of us. Our need of him is total, he owes us nothing. Difficult to establish any relationship between such radical unequals, but leaving that point aside, we are faced with the next question that arises, which is why, in that case, did God create the universe. The only possible answer is because he wished to. And why did he wish to? The answer you give to overpersistent children—because he did.