Some of his notable writings include:
- Catechismus Catholicus - a widely-used catechism for Catholic communities in the United States.
- System der katholischen Dogmatik - a systematic presentation of Catholic dogmatic theology.
- Das Leben des heiligen Franz von Assisi - a biography of St. Francis of Assisi.
- Die Geschichte der katholischen Kirche - a history of the Catholic Church.
- Die Kanzelberedtsamkeit - a treatise on the art of preaching.
- The Christian's Manual of Devotion - a prayer book and devotional guide.
- Practical Commentary on Holy Scripture - a commentary on the Bible.
- The Life and Letters of St. Augustine - a biography of St. Augustine of Hippo.
- Lectures on the History of Philosophy - a series of lectures on the history of philosophy.