As soon as you begin to enjoy the fruits of your earthly cares, a hitherto unforeseen source of sorrow reveals itself in your soul, and this sorrow strikes you powerfully, suddenly depriving you of your peace of heart and of the comfort you so longed for. You cease to be interested in anything; nothing seems to exist for you—you feel overburdened by grievous sorrow and deadly anguish. What does this mean? What malicious, envious power falls upon us as soon as we begin to live for our own gratification? Why does our soul begin to grieve and be afflicted at the very time when, in our opinion, it should rejoice? Listen to me, disciple of Christ. You thought to live upon earth in peace and pleasure, when the earthly path must be a most sorrowful and narrow one; you thought to find tranquillity and pleasure in corruptible things and not in Christ, Who alone is the rest and eternal blessedness of our souls; and the Lord—not wishing that we should live here in peace and plenty, and thus forget the one thing needful, the salvation of our soul and our heavenly country, but desiring that we should seek our rest and blessedness in Him alone.

–St. John of Kronstadt, My Life in Christ