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It is on good ground that he calls it the peace of God, inasmuch as it does not depend on the present aspect of things, and does not bend itself to the various shiftings of the world, but is founded on the firm and immutable word of God. It is on good grounds, also, that he speaks of it as surpassing all understanding or perception, for nothing is more foreign to the human mind, than in the depth of despair to exercise, nevertheless, a feeling of hope, in the depth of poverty to see opulence, and in the depth of weakness to keep from giving way, and, in fine, to promise ourselves that nothing will be wanting to us when we are left destitute of all things; and all this in the grace of God alone, which is not itself known otherwise than through the word, and the inward earnest of the Spirit.
John Calvin, Commentary on Philippians 4:7.