But for every kind of study, and more especially for night work, good health and its chief source, simple living, are essential; for we have fallen into the habit of devoting to relentless labour the hour which nature has appointed for rest and relaxation. From those hours we must take only such time as is superfluous for sleep, and will not be missed.

For fatigue will make us careless in writing, and the hours of daylight are amply sufficient for one who has no other distractions. It is only the busy man who is driven to encroach on the hours of darkness. Nevertheless, night work, so long as we come to it fiesh and untired, provides by far the best form of privacy.

But although silence and seclusion and absolute freedom of mind are devoutly to be desired, they are not always within our power to attain. Consequently we must not fling aside our book at once, if disturbed by some noise, and lament that we have lost a day: on the contrary, we must make a firm stand against such inconveniences, and train ourselves so to concentrate our thoughts as to rise superior to all impediments to study. If only you direct all your attention to the work which you have in hand, no sight or sound will ever penetrate to your mind.

If even casual thoughts often occupy us to such an extent that we do not see passers-by, or even stray from our path, surely we can obtain the same result by the exercise of our will. We must not give way to pretexts for sloth. For unless we make up our mind that we must be fresh, cheerful and free from all other care when we approach our studies, we shall always find some excuse for idleness.