Boundaries Of Time
The most important lesson is that there must be a fixed time for life. Each one of these must have its time and place - the boundaries of one never encroaching upon the other. This is the secret of the machine of life and success in the world. If people would only have the sense to act this way, they would not feel any weakness in the elderly years, not in body nor in spirit. They would not be senselessly running after spas and doctors but would live out their years in peace, at home with their families.
(Rav Yosef Ber Soloveichik)