A.B. Bruce's first series of Gifford Lectures, delivered in Glasgow (1897), has in view several thoughts: that God cares for humans individually and collectively; that His nature is such, and that He sustains such a relation to man, as makes that care natural and credible; that His care covers all human interests, but especially the higher, ethical interests of righteousness and goodness in the individual and society; that He is a moral Governor and benignant Father, a Power bringing forth righteousness and overcoming evil with good; and that He rules over all things with a view to bringing about a kingdom of the good. For Professor Bruce, the great matter is not 'that' God is, but 'what' God is. The 'Providential Order' lectures explore this question in light of "Providence." Bruce's line of proof, in keeping with the Gifford trust, is "through man to God."
A.B. Bruce's second series of Gifford Lectures, delivered in Glasgow (1898) focus on an historical survey of the Moral Order. The first series of lectures had been on Providential Order, which Bruce considered theistic. Here, Bruce includes in his survey those whose moralities do not necessarily hold to a belief in a living personal God, as well as theists. The author conducts his survey in light of the question, with regard to the moral order, "what have the wisest thought?" Included in the survey are chapters on Buddha, Zoroaster, the Stoics, Job, Jesus, Browning, and modern dualism.