The content of the believer’s mind will determine the contentment of his soul. “Thou wilt keep him in perfect peace, whose mind is stayed on Thee” (Isaiah 26:3a). The mind occupied with the content of the Word of God is promised perfect peace. This peace is the result of right thinking.
In the passage Philippians 4:4-9, the apostle Paul has explained the process of right thinking. Notice in this passage that it is God who is promising to produce peace in the believer’s heart, when the believer produces the action of fixing his mind on the stability of Jesus Christ. Therefore, it is possible for contentment to be present in the midst of any and all of life’s circumstances.
Although the apostle Paul was in jail when he wrote this, he was content because of right thinking. He was able to rejoice. The Greek word for “rejoice” in verse 4 is chairete, which means that the believer is commanded to produce the action of continuously (both now and in the future) relaxing with God, even in adverse situations. The old sinful, adamic nature instantly produces anxiety, panic, fear, discouragement, unbelief, and other effects of its inherent death. This is the wrong thought process and should be cast down so that thoughts of obedience to Christ can take over the mind (2).