Our subject this morning is "The Personality of the Holy Spirit." No series of sermons upon the Fundamentals of our Christian faith would be complete without a sermon on the Personality and Deity of the Holy Spirit. The doctrine of the Personality of the Holy Spirit is both fundamental and vital. Any one who does not know the Holy Spirit as a person has not attained to a complete and well-rounded Christian experience. Any one who knows God the Father and God the Son, but who does not know God the Holy Spirit has not attained unto the Christian conception of God, nor to a fully Christian experience. It may seem to you at first thought as if the doctrine of the Personality of the Holy Spirit were a purely technical and apparently impractical doctrine, but it is not so. As we shall see shortly, the doctrine of the Personality of the Holy Spirit is a doctrine of the very first practical importance. I. THE IMPORTANCE OF THE DOCTRINE OF THE PERSONALITY OF THE HOLY SPIRIT 1. _The Doctrine of the Personality of the Holy Spirit is of the highest importance from the standpoint of worship._ If the Holy Spirit is a person and a Divine Person, and He is, and if we do not know Him as such, if we think of the Holy Spirit only as an impersonal influence or power, then we are robbing a Divine Person of the worship which is His due, and the love which is His due, and the confidence and surrender and obedience which are His due. And may I stop at this point to ask each one of you, "Do you worship the Holy Spirit?" Theoretically we all do, every time we sing the long metre Doxology, "Praise God from whom all blessings flow, Praise Him all creatures here below. Praise Him above, ye heavenly hosts, Praise Father, Son _and Holy Ghost_."