The thoughts embodied in the following exercise are the ones you want to think. You should take the exercise once or twice daily, but you should think the thoughts continuously. That is, do not think them twice a day for a stated time and then forget them until it is time to take the exercise again. The exercise is to impress you with the material for continuous thought.  

Take a time when you can have from twenty minutes to half an hour secure from interruption, and proceed first to make yourself physically comfortable. Lie at ease in a Morris chair, or on a couch, or in bed; it is best to lie flat on your back. If you have no other time, take the exercise on going to bed at night and before rising in the morning.  

First let your attention travel over your body from the crown of your head to the soles of your feet, relaxing every muscle as you go.