Although not well-known in the English-speaking world, Fr. Ambroise Gardeil, OP (1859-1931) was a Dominican of significant influence in French Catholic thought at the turn of the 20th century. The True Christian Life provides a thorough and stirring introduction to Fr. Gardeil's work in spiritual theology.
"Originally published as La vraie vie chrâetienne, (Paris: Desclâee de Brouwer, 1935)."