His major theological work was his major study addressing the Person of Christ. He arrived at a kenotic doctrine of incarnation following his fellow Scot P. T. Forsyth. His other influential work was the 'Christian Experience of Forgiveness' which attempted to creatively restate the Protestant doctrines of justification and atonement. He argued that justification was forgiveness and that the cross was the cost of forgiveness to God. He also taught T. F. Torrance dogmatics - (systematic theology).