Note 19 at Phil. 4:6: Today we think of "careful" as meaning "to be cautious." But nearly 400 years ago when the KJV was translated, it meant to be full of cares or anxiety. Paul is admonishing these Philippian believers who had been worried about his imprisonment (Phil. 1:12) and Epaphroditus being sick (Phil. 2:26) to cast all their cares upon the Lord. There is no better way to do this than to rejoice in the Lord all the time. Rejoicing makes us focus our attention on the Lord and His promises instead of our negative circumstances.

Note 20 at Phil. 4:6: Most believers realize that anxiety and worry are not good and try to avoid them. But most believers do not believe that it is possible to live a live totally free of care (see note 19 at this verse). Yet Paul commands us to be careful for nothing. That means there is nothing that we should be worried about. There are no limits to the peace of God.

Note 21 at Phil. 4:6: The way we keep from being careful is to take our needs to the Lord in prayer and give thanks by faith that God has answered. Those who are still burdened have not totally cast their care over on to the Lord. "...Casting ALL your care upon him, because he careth for you" (1 Pet. 5:7).