How important it is that we "stand porter at the door of thought" when subjected to what seems to be a persistent parade of unwanted and unwelcome mental images knocking at that door! Mrs. Eddy writes in Science and Health (p. 392): "Stand porter at the door of thought. Admitting only such conclusions as you wish realized in bodily results, you will control yourself harmoniously."
If we expect demonstration, unfoldment, healing (whatever term we use) to be instantaneous, we must react instantly to any suggestion of discord, inharmony, disease, accident, death, failure, sin, or limitation. During each day we are confronted with a stream of mental pictures, some good, others not so good or, perhaps, downright evil. Are we accepting them all at face value, or are we challenging each one and questioning both its source and its message?
A piece of polarized glass will permit passage of only those rays of light which conform to the crystalline structure of the glass. This may provide a helpful parallel to the mental selectivity we must employ in permitting only those thoughts that conform to the will of God to enter consciousness. Thus we shall keep out any unworthy thought projections which clamor for acceptance, whether subtle or blatant. These mental images may take the form of personal or family problems, or they may suggest trouble happening to other people in more remote areas. Regardless of the source, any suggestion of evil must be denied origin, presence, or power.
