…Everything is from God: both illness and health; and everything that comes from God is given to us for our salvation. Thus should you look upon your illness and thank God for being concerned about your salvation. In what manner that which God sends us works for our salvation – we do not know, and perhaps it is not for us to know. God sends us one thing for the sake of punishment, as a form of penance; another thing for instruction, so that a person may regain his right mind; another to deliver a person from misfortune, which would befall him were he in good health; another for a person to show his patience and thus earn a good reward; another to purify us from passions, and many other reasons… But you, as you think of your sins, should say: “Glory to Thee, o Lord, for having subjected me to penance in punishment!” When you remember that formerly you have not always thought of God, you should say: “Glory to Thee, o Lord, that Thou hast given me a reason to think of Thee more often!” When the thought comes into your mind that if you were healthy, you would do things that were not so good, then say: “Glory to Thee, o Lord, that Thou restrains me from sin,” and so on in everything… Thus be of good cheer!
Saint Theophan the Recluse