Do not have any partiality, not only either for food and drink, for dress, for a spacious and richly decorated dwelling, for the luxurious furniture of your house, but not even for your health, do not even have the least partiality for your life, give up all your life to the Will of the Lord, saying: “for, to me to live—is Christ and to die—is gain.” [Philippians 1.21]. “He that hateth his life in this world, shall keep it unto life eternal.” [John 12.25] Attachment to the temporary life, to one’s own health, leads to many deviations from God’s Commandments, to the indulgence of the flesh, to breaking the fasts, to evading the conscientious fulfilment of the duties connected with our service, to despondency, impatience, irritability. Never sleep before saying evening prayers, lest your heart should become gross from ill-timed sleep, and lest the enemy should hinder it by a stony insensibility during prayer.
—St. John of Kronstadt, My Life in Christ