Concentrating Attention.
The quiet end of the day is almost as good for clear thinking as the early morning, especially if the day has not been overstrenuous and the activities have been gradually tapered off.
There are many instances that would seem to show that the strenuous gait is the best, but nearly all of these evidences are questionable. When finally simmered down, the good work done under high pressure is frequently due to latent ideas that were the product of quiet thinking. The mood and the dominant idea may be predicated as necessary.
As already stated, the habit of thought most favorable for the persistence of a single group of ideas is attained by the practice of switching the attention back to the desired subject.
This should be done at the opportune time. The subject should not be forced on a tired mind. It should not be taken in as a painful duty, but it should be made the one thing of interest. Really valuable results can only come along the line of the dominant thought. All other work lacks directness. It follows precedent to an unnecessary extent.