Video from The Thomistic Institute
"He has granted to us His precious and very great promises, that through these you may escape from the corruption that is in the world because of passion, and become partakers in the divine nature.” (2 Peter 1:4) Christian theology considers who God is in himself, in his own inner life. The mystery of the Trinity is the primary mystery in Christianity because it concerns who God is and the fact that God has willed to offer us knowledge of himself—even participation in his own divine life by grace. The Science of Theology (Aquinas 101) - Fr. Thomas Joseph White, O.P." from video introduction.