Purposely putting out one thought and occupying the mind with another may be called the method of substitution. Exclusion of discordant thoughts furnishes opportunity for harmonious ones to take their place. If the purpose is intense enough, the
new thought will never have to be sought for, because ceasing to think one thought uncovers another which at once presents itself in the place of the one which was discarded.

Decisive action at this point in the process is especially important. On the instant and without hesitation, seize the first thought which appears and hold it tenaciously. When the dangerous intruder has been dislodged, the positive, unwavering acceptance of the new thought will close the door and lock it behind the ejected intruder. To occupy the mind in looking about for some specially appropriate thought will cause such indecision and vacillation as will give the one excluded abundant opportunity to return. Do not stop at first to question the character of the newcomer. That can be decided later when the mental control is more assured, and then if another more desirable thought presents itself, it may be accepted in its turn.

The mind must be active. The room which was once filled with erroneous and discordant thoughts, but which has been swept clean of them, must immediately be filled with desirable ones so that there may be no place for the return of the former objectionable occupants. "We should have our principles ready for use on every occasion" is as true now as when Epictetus first declared it. Good thoughts will then be ready to appear as soon as they are given the opportunity by the turning out of bad ones. Of course it is at all times and in every way advantageous intentionally and consciously to bring good thoughts into the mind and keep them there; then evil ones will not have an opportunity to enter.

In the prosecution of this mental training employment of any kind is a decided advantage because it keeps the mind occupied with a better kind of thinking than might otherwise fill it. Herein lies one of the greatest benefits connected with labor. The labor should not be such as results in great physical fatigue, nor should it require such special attention as to produce mental exhaustion. It should be neither excessive nor insufficient, but adapted mentally and physically to the condition of the person who is employed in it. If excessive, there is danger of mental reaction through fatigue; if insufficient, there is danger that the unoccupied mind may take up some objectionable topic. Mental activity and the character of that activity are the essentials; the labor is valuable only as an aid to control mental action.

Herein, also, lies the advantage connected with travel and change of scene. Under these circumstances nearly every one submits himself to the suggestions of his new surroundings and allows his mind to follow them without any effort at control. Removal from the old familiar environment into scenes of an entirely different character gives new suggestions which substitute new lines of thinking in place of the former habitual ones, and these changed mental conditions bring fresh stimulus to the physical system. It is change of thinking which causes the beneficial result, not change of air.

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Stephen C Campbell (Master NLP Practitioner) has published more information on using the Subconscious as a Goal Setting tool at
http://www.rightandwrongthinking.com/