Philippians 4:7

And the peace of God which passeth all understanding, shall guard your hearts and your thoughts in Christ Jesus.

The peace of God ... This was described by Hendriksen as "The smile of God reflected in the soul of the believer, the heart's calm after Calvary's storm, the conviction that God who spared not his own Son will surely also, along with him, freely give us all things (Romans 8:32)."[19]

Passeth all understanding ... Those who see it manifested in the lives of Christians cannot understand such peace exhibited despite the slings and arrows of outrageous fortune encountered by them; even those who possess it cannot fully understand it; but those who have experienced it would not exchange it for anything that the world has to offer.

Shall guard your hearts ... The scholars tell us that this is translated from a military term signifying a sentinel guarding a city. As Philippi was a Roman colony, populated with many retirees from the military establishment of Rome, this must rank as another marvelous analogy drawn by Paul from things which he observed in his travels. Such metaphors as those of the athletic contests in Olympian games or the triumphal processions of generals and rulers are also included.

In Christ Jesus ... Paul's favorite expression again appears here. To understand all that is meant by these words is to grasp in its fullness the whole theology of the apostle Paul, and indeed all the New Testament writers. One may only be amazed that so many commentators pay no attention at all to these most important words. Out of Christ there is nothing; in him is the life eternal; and people (let all people hear it) are "baptized into Christ," as Paul himself declared (Romans 6:3). What about faith? No unbeliever can be baptized, and no believer is in Christ until he is baptized into him.