But nothing causes such exceeding grief as when anyone, lying under the captivity of sin, calls to mind from where he has fallen, because he turned aside to carnal and earthly things, instead of directing his mind in the beautiful ways of the knowledge of God. So you find Adam concealing himself, when he knew that God was present and wishing to be hidden when called by God with that voice which wounded the soul of him yourself? Why are you concealed? Why do you avoid Him Whom you once longed to see? A guilty conscience is so burdensome that it punishes itself without a judge, and wishes for covering, and yet is bare before God.

St. Ambrose of Milan

Thanksgiving dulls the fierceness of your illness!  Thanksgiving brings the ailing person consolation!  The tutored heart, sweetened by thanksgiving, is renewed through the power of a living faith.  Illumined by the sudden light of faith, the mind begins to contemplate the divine Providence of God... The sickbed is often the place where one gains the knowledge of God and the knowledge of self.  The suffering of the body often brings spiritual joys, and the sickbed is often watered with tears of repentance and tears of joy in God.

St. Ignatius Brianchaninov

In the words of the psalmist, "As you lie in bed, repent of what you say in your heart" (Ps. 4:4 LXX), that is, repent in the stillness of the night, remembering the lapses that occurred in the confusion of the day and disciplining yourself in hymns and spiritual songs (cf. Col. 3:16) – in other words, teaching yourself to persist in prayer and psalmody through attentive meditation on what you read. For the practice of the moral virtues is effectuated by meditating on what has happened during the day, so that during the stillness of the night we can become aware of the sins we have committed and can grieve over them.

St. Peter of Damascus

The man who really loves the Lord, who has made a real effort to find the future Kingdom, who is really pained by his sins, who is really mindful of eternal torment and judgment, who really lives in fear of his own departure, will not love, care, or worry about money, or possessions, or parents, or worldly glory, or friends, or brothers, or anything at all on earth.

St. John Climacus

Have confidence in the compassion of our Creator. Reflect well on what you are now doing, and keep before you the things you have done. Lift up your eyes to the overflowing compassion of heaven, and while He waits for you, draw near in tears to our merciful Judge. Having before your mind that He is a Just Judge, do not take your sins lightly; and having also in mind that He is compassionate, do not despair. The God-Man gives man confidence before God.

St. Gregory the Great

Why do we judge our neighbors? Because we shun knowing ourselves. Someone busy trying to understand himself has no time to notice the shortcomings of others. Judge yourself ... and you will stop judging others. Judge a poor deed, but do not judge the doer. It is necessary to consider yourself the most sinful of all, and to forgive your neighbor every poor deed.

St. Seraphim of Sarov