Romans 2:21

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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Ambrosiaster

AD 400
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.

George Leo Haydock

AD 1849
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)

John Chrysostom

AD 407
Sometimes Paul speaks more harshly and sometimes more softly. Here he does not attack them directly … but carries on his discourse by way of questions, getting them to give the answers themselves.

Shepherd of Hermas

AD 150
How will you instruct the elect of the Lord, if you yourselves have not instruction? Instruct each other therefore, and be at peace among yourselves, that

Tertullian of Carthage

AD 220
Hence his invective against the transgressors of the law, who teach that men should not steal, and yet practise theft themselves.

Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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