Q. Father Fortea, what is the greatest evil?
A. According to the Catechism of the Catholic Church, the greatest evil is sin (CCC 1488).
Since God is love and sin leads to the rejection of His love, sin inevitably leads to hatred – of God, of humanity, of those around us, and of ourselves. Those who allow themselves to walk the path of hatred can reach the point where they hate all four objects with their entire strength. Such a consuming hate is the final stage of total moral degradation.