Read Colossians 1:28 Using Other Translations
Whom we preach, warning every man, and teaching every man in all wisdom; that we may present every man perfect in Christ Jesus:
Him we proclaim, warning everyone and teaching everyone with all wisdom, that we may present everyone mature in Christ.
So we tell others about Christ, warning everyone and teaching everyone with all the wisdom God has given us. We want to present them to God, perfect in their relationship to Christ.