I wonder if we realize how much our fatigue effects others? For example, how does it effect a husband to know he is coming home to a tired and cranky wife? How different would it be if he knew he would receive a sincere and warm welcome from a loving wife? Do our children receive abundant love and kindness from us throughout the day, or do they feel like a burden? How about the effect on our own soul, and our passion for our Saviour?
Donald Whitney, in his book, Simplify Your Spiritual Life, says, "Sometimes the most spiritual thing you can do is to take a nap." He goes on to say,
God made us a unity of body and soul, and one influences the other. When your soul is either happy or discouraged, it can affect how your body looks and feels. And when your body is exhausted, it tends to dampen the zeal of your soul. In fact, fatigue often weakens our resolve against temptation and provides excuses for anger, lust, and other sins. (p.161)Granted there are seasons when this sort of fatigue is unavoidable (and we are still accountable for our sin). But I think we sometimes forget that our body, mind and spirit are intricately connected.
John Piper, in his book, When I Don't Desire God, quotes Martyn Lloyd-Jones on spiritual depression. Lloyd-Jones was a medical doctor before becoming one of the greatest preachers of the 20th century. He says,
Does someone hold the view that as long as you are a Christian it does not matter what the condition of your body is: Well, you will soon be disillusioned if you believe that...You cannot isolate the spiritual from the physical for we are body, mind and spirit. The greatest and the best Christians when thay are physically weak are more prone to an attack of spiritual depression than at any other time and there are great illustrations of this in the scriptures. (p.211)
It is truly humbling to realize our own weakness. We are not the Fountain of Life, but rather borrowers of life. The Only Immortal lends us energy even to take each breath. We are not God. So go take a nap!