The central message of this sermon is that true peace and security come from trusting in God and having one's mind fixed on Him, rather than relying on external circumstances or one's own understanding. The speaker emphasizes that the Hebrew concept of "perfect peace" (shalom shalom) refers to a state of being where one's thoughts are firmly anchored and dependent on God, much like Samson's physical position when he braced himself against the temple pillars before pushing with all his might. This image illustrates the idea that our minds must be fixed on God in order for us to experience true peace and security. The speaker encourages listeners to understand their part in achieving this state of being by staying their mind on God, and trusting in His presence and provision.