“Authentic tidings of invisible things,
    Of ebb and flow and ever during power,
    And central peace subsisting at the heart
    Of endless agitation,”

then we have, indeed, a recreation which will give us, not merely pleasure, but strength, refreshment, and confidence.  Something of the same feeling we may get from an appreciation of great music, beautiful pictures, splendid architecture, and other things that stir us with an impression of everlasting greatness.  Enjoy these and cultivate the appreciation of them, but especially, if you can, cultivate the enjoyment of the beauty of nature, because it costs nothing and is everywhere for everybody; and if we can find recreation in such things as these, then, indeed, we may make the joy of life great as well as the duty of life, and we may find that the joy of life and the duty of life are not things adverse or even to be contrasted, but may be, as Colonel Roosevelt puts them, companions and complements of each other.