<p>2:21 <i>Y</i><i>ou therefore that teach another, don&rsquo;t you teach yourself?-</i> Paul was teaching the Romans. Thus the allusion to himself is clear- he who teaches others must teach himself, must apply to himself the principles which pass his lips so easily. He may be referring back to his theme in 2:2,3- that we have a tendency to assume that Divine truths aren&rsquo;t relevant to us personally, that punishment for sin and condemning others isn&rsquo;t, actually, going to come&nbsp;<i>on me</i>, although we know it will surely come&nbsp;<i>on others</i>. And so Paul is saying that he too must be aware of this- that he places himself in the audience of those whom he is teaching. See on Rom. 3:19.</p><p><i>You that preach a man should not steal, do you steal?</i>- Stealing was felt to be a crime which could and should be openly, publicly rebuked.&nbsp;</p>