In chapter seven of Saint Thomas Aquinas Vol. 2: Spiritual Master, Fr. Torrell complies a number of quotes from St. Thomas about how the Holy Spirit makes us friends of God—all taken, I believe, from SCG IV. What’s remarkable is how St. Thomas takes some feature of natural friendship between human persons and then shows that applies to man’s friendship with God, established by the Holy Spirit. The texts therefore tell us something both about natural friendship and about our life with God.
Here’s one example of this (Torrell quotes this on pg. 170 but the translation here is not taken from Torrell, but from the version here):
It also belongs to friendship that a man delight in the presence of his friend, and rejoice in his words and deeds: also that he find in him consolation in all his troubles: hence it is especially to our friends that we have recourse for comfort in time of sorrow. Since then the Holy Ghost makes us to be friends of God, and causes Him to live in us, and us in Him, as we have proved, it follows that it is through the Holy Ghost that we rejoice in God, and are comforted in all the hardships and afflictions of the world. Hence it is said (Ps. l. 14): Restore unto me the joy of thy salvation, and strengthen me with thy perfect Spirit, and (Rom. xiv. 7): The Kingdom of God . . . is justice, and peace, and joy in the Holy Ghost, and (Acts ix. 31): The church had peace . . . and was edified, walking in the fear of the Lord, and was filled with the consolation of the Holy Ghost. For this reason our Lord calls the Holy Ghost by the name of Paraclete or Consoler (Jo. xiv. 26): But the Paraclete, the Holy Ghost, etc.