This caught my attention from the sermons of John Tauler.
If you wish to contemplate the Holy Trinity within you, keep these three points in mind. First, keep God alone before your eyes, His honor, and not your own. Secondly, in all your works and exterior activities keep a close watch over yourself; be constantly mindful of your utter nothingness, and observe carefully what occupies you most. Thirdly, ignore what goes on around you: If it is not your business, do not pay attention to it; it will take care of itself. If things are good, let them be so; if they seem bad, do not criticize and ask questions. Turn into the depth of your ground and remain there, so that you may hear the voice of the Father who calls you. He calls you to Himself.