<p>4:20- see on Acts 20:25 <i>I know</i>.</p><p><i>Erastus remained at Corinth</i><i>, but Trophimus I left at Miletus sick</i>- Perhaps this is a lament of loneliness. Instead of coming to Paul, Erastus had remained at Corinth. Hence Paul's urging of <i>Timothy</i> to not be like the rest and find excuses not to come to him.</p>