"Rejoice in the Lord alway: and again I say, Rejoice" (Philippians 4:4).
Barnes' Notes made this comment on this particular verse of Scripture - "The Christian, therefore, may be, and should be, always a happy man." As a Christian, are you always happy? Do you find yourself always rejoicing in the character, law, and promises of God?
Matthew Henry made this comment - "If good men have not a continual feast, it is their own fault." In this verse, Paul called all Christians to a lifestyle of joy that emanated from an active choice of their will - regardless of whether confronted with adverse or joyful circumstances or people. With this in mind, are you enjoying a "continual feast" because you are choosing to "rejoice" in your God and not circumstances? If not, know that it is your own fault for the power of God is available to empower you to work out this command.
It is crucial that the believer "rejoices" in the right object for this is how he obtains his joy. He must never "rejoice" in his situations but in His Savior - not in circumstances but in Christ.
To the world, joy consists of success, good fortune, and well-being. To the child of God, it involves a deep-seated confidence that God is in control of everything for the believer's good and for His own glory.
John MacArthur made this remark - "Knowledge of God is the key to rejoicing." Hence, those who know the great truths about God find it very easy to "rejoice...alway," whereas, those who have very little knowledge of God and His ways find it very difficult to obey this command.
Never forget that in order to work out this command, you must choose to "arrange your mind" (Precept Commentary). If you will take the first step, God will be there to carry you through to enjoying a "continual feast" in Him.