You can throw doubts and negative thoughts aside if you can constantly remember your meditation. After you have stopped meditating you must try to remember these few minutes with utmost joy, affection and concern. You must cherish them as an object of adoration. During all of your ordinary activities try to remember your soulful meditation and do not forget the necessity of retaining a spiritual consciousness or spiritual thoughts. Do not allow your mind to sink to a low level. If you can maintain pure thoughts, divine thoughts, when you are not meditating, you will have additional strength when you do meditate.
Any time doubt and negative thoughts come, you have to stop them immediately with your divine thoughts. In this way you will be able to conquer your negative thoughts. If your thoughts are pure during the entire day, then when you meditate, your mind will already be pure. But if you allow your thoughts to roam in the world of ignorance and impurity for fourteen or sixteen hours a day, how can you expect your thoughts to be pure at the time of your meditation?From:Sri Chinmoy,Mind-confusion and heart-illumination, part 1, Agni Press, 1974
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