05/31/2026
The mystery of the Most Holy Trinity, as explained by St. Thomas Aquinas:
God is perfectly simple and perfectly alive. In knowing Himself, the Father expresses everything He is in one perfect act of understanding. This perfect self-knowledge is not something impersonal—it is so complete, so living, that it is a Person: the Son, the eternal Word.
The Son, therefore, is the Father’s perfect knowledge of Himself—everything the Father is, known and expressed in one eternal Word.
Likewise, in loving Himself, the Father breathes forth a perfect act of love. This love is not merely a feeling or force; it is so real, so full, that it is also a Person: the Holy Spirit.
The Holy Spirit is the Love that proceeds from the Father (and the Son), the fullness of divine love.
Unlike us, who come to know ourselves gradually and learn to love over time, in God there is no before or after. His knowing and loving are eternal, perfect, and simultaneous.
Thus, in the one divine nature:
— The Father knows Himself → and this is the Son.
— The Father loves Himself → and this is the Holy Spirit.
Three distinct Persons. One God. Eternal, perfect communion of knowledge and love.