Who, then, understands this and faithfully discerns is not able to rejoice in works but only in the goodness of God. And the one who truly recognizes that God’s goodness is the cause of his joy, does not hold that his joy be only for himself but rejoices for all creatures. His joy comes to be more abundant than the sea, because it is the goodness of the God of the universe affording such joy, and all creation is a partaker in it, even sinners share in this.
So then, he is quick to rejoice even for sinners. He says in fact: ‘They are not far from mercy because of the goodness of the Lord of the universe by which righteousness has been given even to me without works.’ And again he says: ‘All like me share in this great good because God is good: He only requires a little will then He gives His grace abundantly and remits sins.’
This is the grace which strengthens the righteous, preserving them by its being near and removing their faults. It is also near to those who have perished, reducing their torments and in their punishment deals with compassion. In the world to come, indeed grace will be the judge, not justice. God reduces the length of time of sufferings, and by means of His grace, makes all worthy of His Kingdom. For there is no one even among the righteous who is able to conform his way of life to the Kingdom.
But if human realities are to be judged and examined according to justice, yet in listening to the word of Scripture one investigates according to exterior knowledge, not entering into the meaning- where is justice here? As it is said, He is merciful in all His works. However, even when He chastises here below or in the life beyond, it is not correct to consider this as justice, but rather fatherly wisdom.
Nor do I call ‘exacting punishment’ even those times when God visits one with a severe aspect, either here or in the life beyond, but rather ‘instruction,’ because they have a good end. On that account, as I said, no one is able to make his way of life resemble the Kingdom and that way of life which is granted only by mercy.
So then I have explained what was already said, that we inherit heaven by what is His and not by what is ours. And this grace is given every day, not just from time to time. If we all receive this grace, let us rejoice in Him who gives it and the greater will be our joy! Let us adore and give thanks for it, and an even greater gift will be given.
Whoever then has joy by reason of his way of life, this joy is false, or rather, his joy is wretched. And not only in his joy is he wretched but also in his understanding. Whoever rejoices because he has truly understood that God is good, is consoled with a consolation that does not pass away, and his joy is true joy. This is because, as was just said his soul has considered and perceived that truly the goodness of God is without measure.
St. Isaac of Nineveh, ‘The Third Part,’ in Isaac the Syrian’s Spiritual Works, ed. and trans. by Mary T. Hansbury (Piscataway, NJ: Gorgias Press, 2016), 102-104.