38 But in order that we really may be able, so far as it is permitted to mortal men, "to comprehend with all the saints what is the breadth, and length, and height, and depth"(33) of the hidden love of the Incarnate Word for His heavenly Father and for men infected by the taint of sins, we must note well that His love was not entirely the spiritual love proper to God inasmuch as "God is a spirit."(34) Undoubtedly the love with which God loved our forefathers and the Hebrew people was of this nature. For this reason the expressions of human, intimate, and paternal love which we find in the Psalms, the writings of the prophets, and in the Canticle of Canticles are tokens and symbols of the true but entirely spiritual love with which God continued to sustain the human race. On the other hand, the love which breathes from the Gospel, from the letters of the Apostles and the pages of the Apocalypse, all of which portray the love of the Heart of Jesus Christ, expresses not only divine love but also human sentiments of love. All who profess themselves Catholics accept this without question.
Source: Haurietis Aquas (Vatican.va)