This is a new translation of St. Bonaventure's classic of Mystical work by one who is an authority on the Seraphic doctor's theology. Written with comprehensive introduction and notes that never exist before in any of the language, this edition is a masterpiece. The Triple Way by the great Franciscan doctor of the Church, St. Bonaventure (1217-1274), is often called the "Summa of Spiritual Theology", a classic which has had and continues to have great influence in the theory and cultivation of the interior life of prayer and penance. This translation with notes by Fr. Peter Damien Fehlner, FI, is prefaced by a lengthy introduction and followed by several appendices illustrating the influence of Sts. Bernard and Anselm on the Seraphic Doctor. The editor is at pains to point out the Marian character of this great work seldom treated by other studies.