We shall first have to study the word Holy in the Old Testament. In Israel as the holy people, the type of us who now are holy in Christ, we shall see with what fulness of symbol God sought to work into the very constitution of the people some apprehension of what He would have them be. In the law we shall see how HOLY is the great keyword of the redemption which it was meant to serve and prepare for. In the prophets we shall hear how the Holiness of God is revealed as the source whence the coming redemption should spring: it is not so much Holiness as the Holy One they speak of, who would, in redeeming love and saving righteousness, make Himself known as the God of His people. And when the meaning of the word has been somewhat opened up, and the deep need of the blessing made manifest in the Old Testament, we shall come to the New to find how that need was fulfilled. In Christ, the Holy One of God, Divine Holiness will be found in human life and human nature; a truly human will being made perfect and growing up through obedience into complete union with all the Holy Will of God. In the sacrifice of Himself on the cross, that holy nature gave itself up to the death, that, like the seed-corn, it might through death live again and reproduce itself in us. In the gift from the throne of the Spirit of God's Holiness, representing and revealing and communicating the unseen Christ, the holy life of Christ descends and takes possession of His people, and they become one with Him. As the Old Testament had no higher word than that HOLY, the New has none deeper than this, IN CHRIST. The being in Him, the abiding in Him, the being rooted in Him, the growing up in Him and into Him in all things, are the Divine expressions in which the wonderful and complete oneness between us and our Saviour are brought as near us as human language can do. And when Old and New Testament have each given their message, the one in teaching us what _Holy_, the other what _in Christ_ means, we have in the word of God, that unites the two, the most complete summary of the Great Redemption that God's love has provided. The everlasting certainty, the wonderful sufficiency, the infinite efficacy of the Holiness that God has prepared for us in His Son, are all revealed in this blessed, HOLY IN CHRIST.