3. Let your house and room be well ventilated.
4. Take time enough for sleep. Do not worry.
5. Watch yourself, but not too closely, to find out what exercise, air, diet, etc., agrees with you. No man can be a rule for another.
6. If you consult a physician, it is better to do it before you are unwell than later.[3]
We close this chapter with the powerful words of Thomas Carlyle, addressed to the students of the University of Edinburgh: "Finally, I have one advice to give you which is practically of very great importance. You are to consider throughout much more than is done at present, and what would have been a very great thing for me if I had been able to consider, that health is a thing to be attended to continually; that you are to regard it as the very highest of all temporal things. There is no kind of achievement you could make in the world that is equal to perfect health. What to it are nuggets or millions?"
[1] Frederic Harrison, Popular Science Monthly Supplement.
[2] Plain Living and High Thinking.
[3] These rules are given by J. Freeman Clarke in his work on Self-Culture.