II. The Name, Titles, and Symbols of the Holy Spirit

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Fire.
While water signifies birth and the fruitfulness of life given in the Holy
Spirit, fire symbolizes the transforming energy of the Holy Spirit’s actions.
the prayer of the prophet Elijah, who “arose like fire” and whose
“word burned like a torch,” brought down fire from heaven on the
sacrifice on Mount Carmel.³⁷ This event was a “figure” of the
fire of the Holy Spirit, who transforms what he touches. John the Baptist, who
goes “before [the Lord] in the spirit and power of Elijah,” proclaims
Christ as the one who “will baptize you with the Holy Spirit and with
fire.”³⁸ Jesus will say of the Spirit: “I came to cast fire
upon the earth; and would that it were already kindled!”³⁹ In the
form of tongues “as of fire,” the Holy Spirit rests on the disciples
on the morning of Pentecost and fills them with himself⁴⁰ The spiritual
tradition has retained this symbolism of fire as one of the most expressive
images of the Holy Spirit’s actions.⁴¹ “Do not quench the
Spirit.”⁴²

From The Catechism of the Catholic Church – rosary.team

Original Link: https://www.vatican.va/archive/ENG0015/__P21.HTM