But he had been forewarned of the dangers of spiritual exaltation and did not allow himself to desist from even the least or lowliest devotion, striving also by constant mortification to undo the sinful past rather than to achieve a saintliness fraught with peril. Each of his senses was brought under a rigorous discipline. In order to mortify the sense of sight he made it his rule to walk in the street with downcast eyes, glancing neither to right nor left and never behind him. His eyes shunned every encounter with the eyes of women. From time to time also he balked them by a sudden effort of the will, as by lifting them suddenly in the middle of an unfinished sentence and closing the book. To mortify his hearing he exerted no control over his voice which was then breaking, neither sang nor whistled, and made no attempt to flee from noises which caused him painful nervous irritation such as the sharpening of knives on the knifeboard, the gathering of cinders on the fireshovel and the twigging of the carpet. To mortify his smell was more difficult as he found in himself no instinctive repugnance to bad odours whether they were the odours of the outdoor world, such as those of dung or tar, or the odours of his own person among which he had made many curious comparisons and experiments.