The central message of the sermon is that true joy and fulfillment in life come from prioritizing eternal treasures over material possessions. The speaker emphasizes that God owns everything, and we are merely stewards or managers of His resources for a temporary time. This message advances the belief that our ultimate goal should be to store up treasures in heaven, rather than accumulating wealth on earth, where it can be lost or stolen. The takeaway is that our priorities should reflect our values, and if we focus on eternal treasures, such as relationship with Christ and serving others, then our hearts will be directed towards what truly matters.