You therefore who teach another, can you not teach yourself? you that preach a man should not steal, do you steal?
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This means: “You who complain about the Gentiles because they are without the law and God are accusing yourself, because you do not believe in the Christ promised by the law but find this belief in those you are complaining about.” The Jew does what he preaches should not be done. For by denying the Christ promised to us in the law, he removes faith by false interpretation and thus does what he preaches against. Commentary on Paul’s Epistles.
Thou, therefore, that teachest another, teachest not thyself St. Chrysostom (hom. vi.) takes these sentences as so many interrogations; dost thou teach thyself? dost thou not steal? dost thou not commit adultery? (Witham)