O Lord and Creator of all, and especially of Your creature, man: You are the God and Father and ruler of Your children; You are the Lord of life and death; You are the guardian and benefactor of our souls.  You fashion and transform all things in their due season through Your creating Word, as You know to be best in Your deep wisdom and providence.  Receive now those who have gone ahead of us in our journey from this life.  Receive us too at the proper time, when You have guided us in our bodily life as long as may be for our profit.  Receive us prepared indeed by fear of You, but not troubled, not shrinking back on that day of death or uprooted by force like those who are lovers of the world and the flesh.  Instead, may we set out eagerly for that everlasting and blessed life which is in Christ Jesus our Lord, to whom be glory forever and ever.  Amen.

St. Gregory the Theologian

Three old men once came to Abba Sisoes [St. Sisoes the Great] because they had heard that he was a great man. And the first one said unto him, "Father, how can I escape from the river of fire?" And Abba Sisoes answered him never a word. Then the second old man said to him, "Father, how can I escape from the gnashing of teeth, and from the worm which never dies?" And Abba Sisoes answered him never a word. Then the third old man said to him, "Father, what will I do? For the remembrance of the outer darkness troubles me." And Abba Sisoes answered and said to them, "I never think on any of these things, but I believe that God is Merciful, and that He will show mercy to me"; then the old men went away grieved at the answer which Abba Sisoes had spoken to them. Now because he did not wish to send them away sorrowful, he brought them back, and said to them, "Blessed are ye, O my brothers, for I have been jealous of you"; and they said to him, "In what matter have you been jealous of us?" And he said, "The first one of you spake about a river of fire; and the second spake about the gnashing of teeth and the worm which dies not; and the third spake about the outer darkness; if remembrances of this kind have dominion over your minds it is impossible for you to commit sin. What can I do who am stubborn of heart? For hardness of heart will not allow me to perceive even that there a punishment for men existeth, and because of this I sin every hour." And when the old men had heard these words, they made excuses to him, and said, "In very truth according to what we have heard, even so have we seen."

from Sayings of the Holy Desert Fathers

Can you place your hope in the world? Whom has it not deceived? To whom has it not lied? It promises much, but gives very little. Only those who hope in the Lord, according to the words of the Prophet David, do not sin, i.e., they are not deceived in their hope!

St. Ambrose of Optina

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

The man who has once chosen pleasure in this life, and has not cured his inconsiderateness by repentance, places the land of the good beyond his own reach; for he has dug against himself the yawning impassable abyss of a necessity that nothing can break through.

St. Gregory of Nyssa

The soul is greater than the body: the body becomes sick, and with that it is finished. But a spiritual sickness extends into eternity. Deliver us, O Lord, from such illness, and grant us healing.

St Macarius of Optina

The mercy of God is hidden in sufferings not of our choice; and if we accept such sufferings patiently, they bring us to repentance and deliver us from everlasting punishment.

St Mark the Ascetic