Philippians 4:6-7 (KJV)
6 Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.
7 And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.
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6 Do not fret or have any anxiety about anything, but in every circumstance and in everything, by prayer and petition ([a]definite requests), with thanksgiving, continue to make your wants known to God.
7 And God's peace [shall be yours, that tranquil state of a soul assured of its salvation through Christ, and so fearing nothing from God and being content with its earthly lot of whatever sort that is, that peace] which transcends all understanding shall [c]garrison and mount guard over your hearts and minds in Christ Jesus.
Peace
1) a state of national tranquillity
a) exemption from the rage and havoc of war
2) peace between individuals, i.e. harmony, concord
3) security, safety, prosperity, felicity, (because peace and harmony make and keep things safe and prosperous)
4) of the Messiah's peace
a) the way that leads to peace (salvation)
5) of Christianity, the tranquil state of a soul assured of its salvation through Christ, and so fearing nothing from God and content with its earthly lot, of whatsoever sort that is
6) the blessed state of devout and upright men after death
Transcend
1. To pass beyond the limits of: emotions that transcend understanding.
2. To be greater than, as in intensity or power; surpass: love that transcends infatuation.
3. To exist above and independent of (material experience or the universe): "One never can see the thing in itself, because the mind does not transcend phenomena" (Hilaire Belloc)