Paul's correction of the church of Corinth's carnality continues with an explanation of what he means by that term. A carnal or naturalistic perspective isn't fitting of an informed Christian life. A mature Christian is someone who takes whatever they rightly know about Jesus and lives accordingly. His exhortation was for them to learn enough about Jesus to do something practical with it.
Christian maturity is when what they know becomes how they live.
Jesus is not a topic Christians should “move on” from.
There is a Heaven to be gained and a Hell to be shunned.