Only the faithful on earth then require that the virtue of hope should strengthen their will lest excessive fear prevent them from possessing God one day?
Yes (XVIII. 4).
Is there a fear attaching to the virtue of hope that is essentially good?
What is this fear called?
This fear of God is called filial fear (XIX. I, 2).
What is meant by filial fear?
By this is meant that one's attitude towards God is that of a holy respect because of His excellence, or of the goodness of His infinite majesty, and that one fears only what displeases Him or keeps us away from Him in such wise as to prevent us from possessing Him eternally in heaven (XIX. 2).
Is there any other fear of God beside this filial fear?
Yes; it is called servile fear (XIX. 2).
What is meant by servile fear?
By this is meant a disposition of an inferior order such as is proper to slaves whereby one fears a master because of the penalties and punishments He is able to inflict (XIX. 2).
Next - The Catechism of the Summa -SECOND SECTION - A DETAILED SURVEY OF MAN'S RETURN TO GOD - VI. OF THE GIFT OF FEAR WHICH CORRESPONDS TO THE VIRTUE OF HOPE OF SERVILE FEAR, AND OF FILIAL (B)