He is delighted to hear you are now fully recovered and again active in your important work for the Cause. However, you should not neglect your health, but consider it the means which enables you to serve. It -- the body -- is like a horse which carries the personality and spirit, and as such should be well cared for so it can do its work! You should certainly safeguard your nerves, and force yourself to take time, and not only for prayer and meditation, but for real rest and relaxation. We don't have to pray and meditate for hours in order to be spiritual.
- Shoghi Effendi (From a letter dated 23 November 1947 written on behalf of Shoghi Effendi to an individual believer; The Compilation of Compilations, Vol. II, The Importance of Prayer, Meditation and the Devotional Attitude)