’Do not call God just, for His justice is not manifest in things concerning you. And if David calls Him just and upright, His Son revealed to us that He is good and kind. ‘He is good’, he says, ‘to the evil and to the impious.’ How can you call God just when you come across the Scriptural passage on the wage given to the workers? ‘Friend, I do thee no wrong: I choose to give unto this last even as unto thee. Or is thine eye evil because I am good?’ How can a man call God just when he comes across the passage on the prodigal son who wasted his wealth with riotous living, how for the compunction alone which he showed, the father ran and fell upon his neck and gave him authority over all his wealth? None other but His very Son said these things concerning Him, lest we doubt it, and thus bore witness concerning Him. Where, then, is God’s justice, for while we are sinners Christ died for us!’
[I, 51 from The Ascetical Homilies of Saint Isaac the Syrian, translated by Holy Transfiguration Monastery, Boston, 250-251]
God’s justice is not subject to our understanding nor our conceptions of justice; indeed, nothing of God is subject to our understanding. God is ‘wholly other,’ and in His essence is beyond our understanding.