United to Christ, we grow in the grace and knowledge of Christ and thus grow more and more desirous of what Christ wants and less and less desirous of what Christ hates. When we grow in grace, the Holy Spirit doesn't put an end to our desires. On the contrary, He renews our minds and transforms our desires to conform to God's desires for us. In essence, contentment is wanting what God wants for us, and what He wants for us is Him. This is why the chief end of man is to glorify God and enjoy Him forever (WSC 1). We most glorify God when we most enjoy what He has created us to desire—Himself.