The central message of this sermon is that our identity as Christians is rooted in our position "in Christ," which is a fundamental truth revealed throughout the book of Ephesians. This idea advances the belief that our spiritual reality and eternal identity are not something we merely imagine or aspire to, but rather it is a concrete fact accomplished by God through Jesus Christ. The teacher wants the listener to understand that their life should be lived in accordance with this newfound identity, which is not just a theoretical concept, but a practical reality that shapes every aspect of their existence. This understanding enables Christians to live in conformity with their calling and position in Christ, rather than merely imagining what they would do if they had a certain status or privilege.