"As for me I say that those who are tormented in hell are tormented by the invasion of love. What is there more bitter and violent than the pains of love? Those who feel they have sinned against love bear in themselves a damnation much heavier than the most dreaded punishments. The suffering with which sinning against love afflicts the heart is more keenly felt than any other torment. It is absurd to assume that the sinners in hell are deprived of God's love. Love is offered impartially. But by its very power it acts in two ways. It torments sinners, as happens here on earth when we are tormented by the presence of a friend to whom we have been unfaithful. And it gives joy to those who have been faithful. That is what the torment of hell is in my opinion: remorse. But love inebriates the souls of the sons and daughters of heaven by its delectability.
"If zeal had been appropriate for putting humanity right, why did God the Word clothe himself in the body, using gentleness and humility in order to bring the world back to his Father?
"Sin is the fruit of free will. There was a time when sin did not exist, and there will be a time when it will not exist.
"God's recompense to sinners is that, instead of a just recompense, God rewards them with resurrection.
"O wonder! The Creator clothed in a human being enters the house of tax collectors and prostitutes. Thus the entire universe, through the beauty of the sight of him, was drawn by his love to the single confession of God, the Lord of all.
“Will God, if I ask, forgive me these things by which I am pained and by whose memory I am tormented, things by which, though I abhor them, I go on backsliding? Yet after they have taken place the pain they give me is even greater than that of a scorpion's sting. Though I abhor them, I am still in the middle of them, and when I repent of them with suffering I wretchedly return to them again.”
"This is how many God-fearing people think, people who foster virtue and are pricked with the suffering of compunction, who mourn over their sin; yet human prosperity compels them to bear with the backsliding which results from it. They live between sin and repentance all the time. Let us not be in doubt, O fellow humanity, concerning the hope of our salvation, seeing that the One who bore sufferings for our sakes is very concerned about our salvation; God's mercifulness is far more extensive than we can conceive, God's grace is greater than what we ask for.
"Repentance is given us as grace after grace, for repentance is a second regeneration by God. That of which we have received an earnest by baptism, we receive as a gift by means of repentance. Repentance is the door of mercy, opened to those who seek it. By this door we enter into the mercy of God, and apart from this entrance we shall not find mercy.
"Blessed is God who uses corporeal objects continually to draw us close in a symbolic way to a knowledge of God's invisible nature. O name of Jesus, key to all gifts, open up for me the great door to your treasure-house, that I may enter and praise you with the praise that comes from the heart."
--St. Issac the Syrian (taken from: http://fatherstephen.wordpress.com/2006/11/01/words-from-st-isaac-of-syria/)