isaiah on Cruelty

The Celebrant and People together, all kneeling Most holy and merciful Father: We confess to you and to one another, and to the whole communion of saints in heaven and on earth, that we have sinne...

My argument against God was that the universe seemed so cruel and unjust. But how had I got this idea of just and unjust? A man does not call a line crooked unless he has some idea of a straight line....