The Third Person of the Blessed Trinity. He is the Spirit of the Father and of the Son and proceeds alike from Both, as from one common principle. He is the personal infinite term of the eternal act of mutual love of the Father and the Son; hence His name of Spirit or Holy Ghost, as the issue or term of God's eternal love or act of will. He is also called the Spirit of Truth, the Creator Spirit, the Sanctifier, as the gifts of creation (or recreation, or regeneration), of revelation, and of sanctification are the outpourings of God's love, and so appropriated to the Spirit of Love, though all eternal Divine effects belong to the common or united action of the Three Divine Persons. He is called Dove, as in this form He descended visibly upon Christ at the Jordan (Mark 1), the dove being a symbol of innocence and of peace. Jesus promised that the Spirit of Truth would "teach you all things and bring all things to your mind, whatsoever I shall have said to you." (John 14) See also:

fruits of the Holy Ghost
gifts of the Holy Ghost
novena to the Holy Ghost

Bibliography Information
Entry for 'Holy Spirit'. 1910 New Catholic Dictionary. https://www.studylight.org/dictionaries/eng/ncd/h/holy-spirit.html. 1910.

Bible Dictionaries Holy Spirit

1910 New Catholic Dictionary

Bible Dictionaries
Holy Spirit