Matthew Henry on Worldliness

The more the world is crucified to us, the more our corrupt passions will be crucified in us. If we would keep calm and quiet, we must by faith live above the stormy region. It is certain those that have anything to do in the world cannot but meet with that every day from those with whom they deal, which will cross and provoke them; and if the affections are set upon these things, and we are filled with a prevailing concern about them as the principal things, those crosses must pierce to the quick and inflame the soul, and that which touches us in these things, touches us in the apple of our eye. If the appetites are indulged inordinately in things that are pleasing to sense, the passions will to the very same degree be roused against those that are displeasing. And therefore, Christians, whatever you have of the world in your hands, be it more or less, as you value the peace as well as the purity of your souls, keep it out of your hearts; and always indulge your affections towards your possessions, enjoyments, and delights in the world, with a due consideration of the disappointment and provocation which they will probably occasion you.

(A Discourse on Meekness and Quietness of Spirit)