Adam Clarke on 2 Timothy 1:17

When he was in Rome - Onesiphorus was no doubt an Asiatic, (probably an Ephesian, see below), who had frequent business at Rome; and when he came sought out the apostle, who, it is supposed, had been confined in some close and private prison, (see the preface), so that it was with great difficulty he could find him out. This man had entertained the apostle when he was at Ephesus, and now he sought him out at Rome. Pure love feels no loads. Here was a true friend, one that sticketh closer than a brother.