Robert Traill (Sermons from 1 Peter 1:1-4), Works 4:14:
This is the way to prove yourselves strangers, by being mortified to things below, and having your affections set on things above. (1.) If you are strangers in this world, then let your affections be weaned from the things that are here below. When a man is posting from one kingdom to another, he will not care much about what he meets with by the way. If he gets a bad lodging to-night, he thinks he will get a better to-morrow, and a few days more be out of that strange land. So it is with the believer. He meets with bad entertainment here; well, a little time will put an end to all. Our light afflictions, which are but for a moment, shall work for us a far mere exceeding and eternal weight of glory, 2 Cor. 4:17. (2.) Prove yourselves to be strangers by your warm thoughts of heaven. Strangers should love their home. If heaven be our inheritance, how delighted should we be with the thoughts of it? How frequently should we converse with it? How often should we send to it? Do ye belong to heaven, and are you strangers on earth? Then, whilst we are denied entrance to our home, let us entertain correspondence with it, like a child that is sent by his father to travel in a strange land; whilst he is denied his father’s sight, he will yet entertain correspondence with him by letters.