He begins by discussing what spiritual theology is before moving into the a description of its journey and goal.

This allowed him to develop a thorough understanding of patristic theology, also developing interests in spiritual theology, mysticism and the history of piety.

Has pioneered Christian ecumenism and written over 150 books on many topics including theology, dogma, comparative theology, spiritual theology, and church history.

While there are many other branches with extremely differing exterior practices, much of the spiritual theology has remained the same since the days of the faith's early Imams.

Thus, these teachings do not lie outside mainstream traditional Roman Catholic spiritual and ascetic theology.

He is best known for his spiritual theology.

His areas of specialization are Mariology and spiritual theology.

Jordan Aumann considered that this idea of the two paths was "an innovation in spiritual theology and a departure from the traditional Catholic teaching".

This book addresses specific problems of spiritual theology and the ascetic life.

During this period, he also furthered his studies in spiritual theology at Rome.