Διὰ τί; Ὅτι οὐκ ἐκ πίστεως, ἀλλ' ὡς ἐξ ἔργων νόμου· προσέκοψαν γὰρ τῷ λίθῳ τοῦ προσκόμματος,
Wherefore? Because they sought it not by faith, but as it were by the works of the law. For they stumbled at that stumblingstone;
¿Por qué no? Porque no la buscaron por la fe, sino como si fuera por obras. Tropezaron con la piedra de tropiezo.