Our unrest comes from yet another source. We have not peace, because we have not found and grasped the true objects for any of our faculties. God is the only possession that brings quiet. The heart hungers until it feeds upon Him. The mind is satisfied with no truth until behind truth it finds a Person who is true. The will is enslaved and wretched until in God it recognises legitimate and absolute authority, which it is blessing to obey. Love puts out its yearnings, like the filaments that gossamer spiders send out into the air, seeking in vain for something to fasten upon, until it touches God, and clings there. There is no rest for a man until he rests in God. The reason why this world is so full of excitement is because it is so empty of peace, and the reason why it is so empty of peace is because it is so void of God. The peace of God brings peace with Him, and peace within. It unites our hearts to fear His name, and draws all the else turbulent and confusedly flowing impulses of the great deep of the spirit after itself, in a tidal wave, as the moon draws the waters of the gathered ocean. The peace of God is peace with Him, and peace within.
I need not, I suppose, do more than say one word about that descriptive clause in my text, It 'passeth understanding.' The understanding is not the faculty by which men lay hold of the peace of God any more than you can see a picture with your ears or hear music with your eyes. To everything its own organ; you cannot weigh truth in a tradesman's scales or measure thought with a yard-stick. Love is not the instrument for apprehending Euclid, nor the brain the instrument for grasping these divine and spiritual gifts. The peace of God transcends the understanding, as well as belongs to another order of things than that about which the understanding is concerned. You must experience it to know it; you must have it in order that you may feel its sweetness. It eludes the grasp of the wisest, though it yields itself to the patient and loving heart.
II. So notice, in the next place, what the peace of God does.
It 'shall keep your hearts and minds.' The Apostle here blends together, in a very remarkable manner, the conceptions of peace and of war, for he employs a purely military word to express the office of this Divine peace. That word, 'shall keep,' is the same as is translated in another of his letters _kept with a garrison_--and, though, perhaps, it might be going too far to insist that the military idea is prominent in his mind, it will certainly not be unsafe to recognise its presence.
So, then, this Divine peace takes upon itself warlike functions, and garrisons the heart and mind. What does he mean by 'the heart and mind'? Not, as the English reader might suppose, two different faculties, the emotional and the intellectual--which is what we usually roughly mean by our distinction between heart and mind--but, as is always the case in the Bible, the 'heart' means the whole inner man, whether considered as thinking, willing, purposing, or doing any other inward act; and the word rendered 'mind' does not mean another part of human nature, but the whole products of the operations of the heart. The Revised Version renders it by 'thoughts,' and that is correct if it be given a wide enough application, so as to include emotions, affections, purposes, as well as 'thoughts' in the narrower sense. The whole inner man, in all the extent of its manifold operations, that indwelling peace of God will garrison and guard.
So note, however profound and real that Divine peace is, it is to be enjoyed in the midst of warfare. Quiet is not quiescence. God's peace is not torpor. The man that has it has still to wage continual conflict, and day by day to brace himself anew for the fight. The highest energy of action is the result of the deepest calm of heart; just as the motion of this solid, and, as we feel it to be, immovable world, is far more rapid through the abysses of space, and on its own axis, than any of the motions of the things on its surface. So the quiet heart, 'which moveth altogether if it move at all,' rests whilst it moves, and moves the more swiftly because of its unbroken repose. That peace of God, which is peace militant, is unbroken amidst all conflicts. The wise old Greeks chose for the protectress of Athens the goddess of Wisdom, and whilst they consecrated to her the olive branch, which is the symbol of peace, they set her image on the Parthenon, helmed and spear-bearing, to defend the peace, which she brought to earth. So this heavenly Virgin, whom the Apostle personifies here, is the 'winged sentry, all skilful in the wars,' who enters into our hearts and fights for us to keep us in unbroken peace.