These words our Lord uttered at a time when, if ever, He was not likely to use words of course, to adopt traditional and misleading phrases. He loved the men He was speaking to, He knew He was after this to have few more opportunities of speaking with them, His love interpreted to Him the difficulties and troubles which would fall upon them, and this was the armour which He knew would bear them scathless through all. That His promise was fulfilled we know. We do not know what became of the majority of the Apostles, whether they did much or little; but if we look at the men who stood out prominently in the early history of the Church, we see how much they stood in need of this peace and how truly they received it. Look at Stephen, sinking bruised and bleeding under the stones of a cursing mob, and say what characterises him—what makes his face shine and his lips open in prayer for his murderers? Look at Paul, driven out of one city, dragged lifeless out of another, clinging to a spar on a wild sea, stripped by robbers, arraigned before magistrate after magistrate—what keeps his spirit serene, his purpose unshaken through a life such as this? What put into his lips these valued words and taught him to say to others, “Rejoice evermore, and let the peace of God which passeth understanding keep your heart and mind”? It was the fulfilment of this promise—a promise which is meant for us as for them. It will be fulfilled in us as in these men, not by a mere verbal petition, not by a craving however strong, or a prayer however sincere, but by a true and profound acceptance of Christ, by a conscientious following of Him as our real leader, as that One from whom we take our ideas of life, of what is worthy and what is unworthy.

[16] “In this designation of the teaching Spirit as holy, there lie lessons for two classes of people. All fanatical professions of possessing Divine illumination, which are not warranted and sealed by purity of life, are lies or self-delusion. And, on the other hand, cold-blooded intellectualism will never force the locks of the palace of Divine truth; but they that come there must have clean hands and a pure heart; and only those who have the love and the longing for goodness will be wise scholars in Christ’s school.”—MACLAREN.

The Expositor's Bible: The Gospel of St John, Vol. II — Part 87