This paper aims to give an analytical description of the theological understanding of the English theologian Cohn E. Gunton. Critically employing Karl Barth's conceptions of personal relation and personal knowledge of theology, Gunton develops them in terms of a mediating function of the Holy Spirit which, he believes, is not developed fully enough in Barth's theology nor in western theology as a whole. However, the mediating function of the Holy Spirit is not to be understood as some kind of direct mediating activity of the Holy Spirit. Exegeting the Gospel of john, Gunton articulates the thesis that the Holy Spirit mediates God's revelation of Jesus Christ to Christians through Holy Scripture and the tradition of biblical interpretation so as to lead Christians into the ”truth,” that is, into a personal relationship with Jesus Christ and into a personal knowledge of Jesus Christ.