So, then, we have three things in this text; the great promise of an Ally in the conflict with the world; the witness which that Ally bears, to fortify against the world; and the consequent witness with which Christians may win the world. I. Now consider briefly the first of these points, the great promise of an Ally in the conflict with the world. I may touch, very lightly, upon the wonderful designation of this Champion-Friend whom Christ sends, because on former occasions in this course of sermons we have had to deal with the same thoughts, and there will be subsequent opportunities of recurring to them. But I may just emphasise in a few sentences the points which our Lord here signalises in regard to the Champion whom He sends. There is a double designation of that Spirit, 'the Comforter' and 'the Spirit of truth.' There is a double description of His mission, as being 'sent' by Jesus, and as 'proceeding from the Father,' and there is a single statement as to the position from which He comes to us. A word about each of these things. I have already explained in former sermons that the notion of 'Comforter,' as it is understood in modern English, is a great deal too restricted and narrow to cover the whole ground of this great and blessed promise. The Comforter whom Christ sends is no mere drier of men's tears and gentle Consoler of human sorrows, but He is a mightier Spirit than that, and the word by which He is described in our text, which means 'one who is summoned to the side of another,' conveys the idea of a helper who is brought to the man to be helped, in order to render whatever aid and succour that man's weakness and circumstances may require. The verses before our text suggest what sort of aid and succour the disciples will need. They are to be as sheep in the midst of wolves. Their defenceless purity will need a Protector, a strong Shepherd. They stand alone amongst enemies. There must be some one beside them to fight for them, to shield and to encourage them, to be their Safety and their Peace. And that Paraclete, who is called to our side, comes for the special help which these special circumstances require, and is a strong Spirit who will be our Champion and our Ally, whatever antagonism may storm against us, and however strong and well-armed may be the assaulting legions of the world's hate.