Read the following words in a book by Swami Chinmayanandaji :
Thus, we compromise with our ideal in seeking the temporary gratification of some passing whim of our mind. On such occasions the usual justification is that it is 'a necessary evil.' And it sounds quite an acceptable excuse in the ears of our society. But a spiritual student must avoid this thorny bush and should never think of taking shelter behind its poisonous foliage. For, invariably we find that 'a necessary evil' very soon becomes 'more and more necessary' and, as we repeat the evil again and again, it is found to become 'less and less evil' in our judgement! This is how a compromise once made tends to perpetuate itself as a habit of the mind. It is through such unconscious cracks that the meditative powers, cultivated and stored up in us, slowly leak out, and the seeker's bosom becomes empty of all its acquired beauty and glory.