Mar Isaac,
From the book, The spiritual world of Isaac the Syrian. Words in bold are the saint’s.
God knew all persons before they became righteous or sinners, yet the fact they underwent change does not change his love. Even many blameworthy deeds are accepted by God with mercy, and are forgiven their authors, without any blame, by the omniscient God to whom all things are revealed before they happen, and who was aware of the constraints of our nature before he created us. For God, who is good and compassionate, is not in the habit of judging the infirmities of human nature or actions brought about by necessity, even though they be reprehensible.
As a grain of sand cannot counterbalance a great quantity of gold, so in comparison Gods use of justice cannot counterbalance his mercy. Like a handful of sand thrown into the great sea, so are the sins of the flesh in comparison with the mind of God. And just as a strongly flowing spring is not obscured by a handful of dust, so the mercy of the Creator is not stemmed by the vices of his creatures.
Let the scale of mercy always be preponderant within you, until you perceive in yourself that mercy which God has for the world. Let this state become a mirror wherein we may see in ourselves that likeness and true image which naturally belong to the Divine essence. By these things and their like we are enlightened so as to be moved toward God with a limpid intellect. A harsh and merciless heart will never be purified. A merciful man is the physician of his own soul, for as with a violent wind he drives the darkness of passions out of his inner self.
Every good care of the intellect directed toward God and every meditation upon spiritual things is delimited by prayer, is called by the name of prayer and under its name is comprehended; whether you speak of various readings, or the cries of a mouth glorifying God, or sorrowing reflection on the Lord, or making bows with the body, or the alleluias of psalmody, or all the other things from which the teaching of genuine prayer ensues.
Reckon every prayer wherein the body does not toil and the heart is not afflicted to be a miscarriage, for this prayer has no soul. At the same time, as Isaac quotes Evagrius, “prayer is joy that sends up thanksgiving”. The paradoxical combination of affliction of the heart and the spiritual joy of thanksgiving becomes a source of tears, which accompany prayer, especially at its higher stages. The fullness of prayer is the gift of tears.
God is not one who requites evil, but he sets evil aright.