A genius little summary from St. Irenaeus, near the close of his great book, of the seven essentials (as he sees it) we receive from the tradition:

[The] path of those belonging to the Church circumscribes the whole world, as possessing the sure tradition from the apostles, and gives unto us to see that the faith of all is one and the same, since all receive one and the same God the Father, and believe in the same dispensation regarding the incarnation of the Son of God, and are cognizant of the same gift of the Spirit, and are conversant with the same commandments, and preserve the same form of ecclesiastical constitution, and expect the same advent of the Lord, and await the same salvation of the complete man, that is, of the soul and body. … For the Church preaches the truth everywhere, and she is the seven-branched candlestick which bears the light of Christ.

— Against Heresies, V.20.1. The seven marks of catholic orthodoxy: eternal Father, incarnate Son, outpoured Spirit, dominical instruction, ecclesial structure, second coming, physical† salvation.

† i.e., not merely spiritual