Adam Clarke on Mark 13:34

Left his house - Οικιαν, family. Our blessed Lord and Master, when he ascended to heaven, commanded his servants to be faithful and watchful. This fidelity to which he exhorts his servants consists in doing every thing well which is to be done, in the heart or in the family, according to the full extent of the duty. The watchfulness consists in suffering no stranger nor enemy to enter in by the senses, which are the gates of the soul; in permitting nothing which belongs to the Master to go out without his consent; and in carefully observing all commerce and correspondence which the heart may have abroad in the world, to the prejudice of the Master's service. See Quesnel.