An extract from 'The Roman Catechism'
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Certain Divine Works are Appropriated to the Holy Ghost

It is also the duty of the pastor to teach that there are certain admirable effects, certain excellent gifts of the Holy Ghost, which are said to originate and emanate from Him, as from a perennial fountain of goodness. Although the intrinsic works of the most Holy Trinity are common to the Three Persons, yet many of them are attributed specially to the Holy Ghost, to signify that they arise from the boundless charity of God towards us. For as the Holy Ghost proceeds from the divine will, inflamed, as it were, with love, we can perceive that these effects which are referred particularly to the Holy Ghost, are the result of God's supreme love for us. Hence it is that the Holy Ghost is called a gift; for by the word gift we understand that which is kindly and gratuitously bestowed, without expectation of any return. Whatever gifts and graces, therefore, have been conferred on us by God -- and what have we, says the Apostle, that we have not received from God? -- we should piously and gratefully acknowledge as bestowed by the grace and gift of the Holy Ghost.