Cap. IV Arg. 5: Eph. 1:5–6 — destinavit εἰς υἱοθεσίαν; adoption only of the faithful
Arg. 5. Their syllogism: those destined unto adoption through Jesus Christ and accepted in Christ as the beloved count as faithful; but Eph. 1:5–6 shows that everyone God elects to salvation he so destines unto adoption through Christ and makes acceptable in the beloved; therefore everyone he elects he considered faithful. They prove the Major from John 1:12 and Gal. 3:26 — no adoption into sons except through faith; you are all sons of God through faith in Christ.
Latin
Arg. 5. Quos Deus destinavit εἰς υἱοθεσίαν per Jesum Christum, quosque in Christo tanquam dilecto acceptos, ii considerantur ut fideles: Sed omnes quos Deus elegit ad salutem, teste Eph. i. 5, 6, destinavit εἰς υἱοθεσίαν per Christum, eosque in Christo tanquam in dilecto gratos facit: Ergo omnes quos elegit ad salutem consideravit ut fideles. Major ex eo probatur, quod nulla est adoptio in filios nisi per fidem, Joh. i. 12, Quotquot eum acceperunt; et Gal. iii. 26, Omnes enim filii estis Dei per fidem in Christo.