But since it is exalted above the understanding of the questioners, and we have to argue from some particular evidence about those things which evade our
knowledge , it is absolutely necessary for us to be guided to the investigation of the Divine nature by its operations. If, then, we see that the operations which are wrought by the Father and the
Sonand the
Holy Spirit differ one from the other, we shall conjecture from the different character of the operations that the natures which operate are also different. For it cannot be that things which differ in their very nature should agree in the form of their operation: fire does not chill, nor ice give warmth, but their operations are distinguished together with the difference between their natures.
If, on the other hand, we understand that the operation of the Father, the Son, and the Holy Spirit is one, differing or varying in nothing, the oneness of their nature must needs be inferred from the identity of their operation. The Father, the
Son, and the
Holy Spirit alike give sanctification, and life, and light, and comfort, and all similar graces. And let no one attribute the power of sanctification in a special sense to the
Spirit, when he hears the Saviour in the
Gospel saying to the Father concerning His
disciples, Father, sanctify them in Your name. So too all the other gifts are wrought in those who are worthy alike by the
Father, the
Son, and the
Holy Spirit: every
grace and power, guidance, life, comfort, the change to
immortality, the passage to liberty, and every other boon that exists, which descends to us.