29 For the Apostle goes on to say, Now there are diversities of gifts, but there is the same Spirit; and there are diversities of ministrations but one and the same Lord; and there are diversities of workings but the same God, Who works all things in all. But to each one is given the manifestation of the Spirit for that which profits. In this passage before us we perceive a fourfold statement: in the diversity of gifts it is the same Spirit, in the diversity of ministrations it is the very same Lord, in the diversity of workings it is the same God, and in the bestowal of that which is profitable there is a manifestation of the Spirit. And in order that the bestowal of what is profitable might be recognised in the manifestation of the Spirit, he continues: To one indeed is given through the Spirit the word of wisdom; and to another the word of knowledge according to the same Spirit; to another faith in the same Spirit; to another the gift of healing in the same Spirit; to another the working of miracles; to another prophecy; to another discerning of spirits; to another kinds of tongues; to another the interpretation of tongues.
Source: On the Trinity (New Advent)