In Epistolam D. Pauli Apostoli ad Galatas notae

to you, other than that which we have preached to you, let him be anathema accursed.

Let us see what the sum of the Gospel is, and how great its certainty.

The Apostle summarizes the sum of the Gospel in 1 Corinthians 15. Furthermore, I declare to you, brothers, the Gospel which I preached to you, which you also received, in which you also stand, by which also, if you retain the speech I preached to you, you are saved, unless you believed in vain. For I delivered to you first of all, that which I also had received, namely that Christ died for our sins, according to the Scriptures, and was buried, and was raised on the third day, according to the Scriptures, and was seen by Cephas, etc.

Thus, he summarizes the sum in Romans 1 and 4, that the Son of God was promised, born according to the flesh from the seed of David, delivered for our sins, and raised for our justification. He continues this same justice, appearing at the right hand of the Father for us, in Romans 8 and Hebrews 9, and from there he is expected for our salvation, just as the same Apostle briefly summarizes the sum of his Gospel in 1 Thessalonians 1. Knowing, beloved brothers, that you are chosen by God, because our Gospel was established among you, not in speech only, but also in power, both in the Holy Spirit and in much certain persuasion, just as you know what manner of men we were among you for your sake. And you became imitators of us and of the Lord, having received the word in much oppression, with the joy of the Holy Spirit, so that you became examples to all