St. John Chrysostom, a beloved Father of the Church, used to say and repeat that the Lord Jesus has preached more often on the Catholic Dogma of Hell than any other subject. Some people say it is better to preach on Heaven. I believe that the more a person meditates on that truth that we call Hell, that meditation produces many fruits of conversion. He left Rome and he went into solitude to meditate on the Holy Gospel. He meditated, prayed and did penance and the Holy Spirit spread the word and people flocked to him.
Holiness attracts souls.
Because of the fear of Hell. I preach often on Hell because the Lord Jesus and Our Blessed Mother asked me to preach on Hell and when I preach on Hell, you feel, you know that I believe in the reality that we call a Roman Catholic Dogma, Hell. The thought of Hell makes saints. Curiously, saints are afraid to go to Hell. St. Therese of the Infant Jesus was afraid to go to Hell.