The mystery of the blessed Trinity is the most unfathomable of the articles of our faith; but it is likewise the most fruitful for our spiritual life. Many souls, nevertheless, even really interior ones, are more inclined to adore it than to strive to know it well. Doubtless they understand that God is within them, that he lives in them and bestows his graceon them; many even willingly recall that this God living in them is the one God in three persons; and they are overcome by a sweet emotion, a humble reverence when they realise that at every instant the great mystery of the generation of the Word by the Father, the procession of the Holy Ghost from the breathing forth of the mutual love of Father and Son, is accomplished in their heart. But generally their thoughts stop there.