True spiritual peace is completely different from the superficial, ephemeral, fragile human peace. It is the deep, settled confidence that all is well between the soul and God because of His loving, sovereign control of one’s life both in time and eternity. That calm assurance is based on the knowledge that sins are forgiven, blessing is present, good is abundant even in trouble, and heaven is ahead. The peace that God gives His beloved children as their possession and privilege has nothing to do with the circumstances of life.
John MacArthur