Abstract Thomas Aquinas and most Christian theologians after him asserted that it is improper to attribute hatred to God. In 1598 the Jesuit theologian Gabriel Vázquez intrepidly argued that God can hate – not only with hatred of abomination but also with inimical hatred. Vázquez's surprising innovation is best explained in the context of the theological disputes between Jesuits and Dominicans on justification. Specifically, Vázquez is elaborating on the idea found in the Council of Trent that justification is a transition from enmity to friendship requiring a real change in the person being justified. He did so to counter views among Dominican theologians that this interior renewal could be in some way operated by God from the outside by way of a reconceptualisation of the sinner or a reevaluation of the value of his meritorious actions. These polemics drove Vázquez to rely on a robust, realist picture of friendship, based on the idea that affections must fit real qualities.