The Catechism says that the Holy Spirit gives them to us as “the first fruits of eternal glory” — so they are literally the beginning of heaven, experienced on earth.
My brother, Deacon Marc, before you are ordained to the priesthood today, you will make a promise of commitment to the priestly life which you will embrace. I will ask you six questions to which you reply in the affirmative indicating your willingness to be uniquely configured to the Person of Jesus Christ which the Sacrament of Holy Orders will effect in you.