53 Granted that the Evangelists and other sacred writers do not explicitly describe the Heart of our Redeemer, living and throbbing like our own with the power of feeling, and ever throbbing with the emotions and affections of His soul and the glowing charity of His twofold will, yet they often set in their proper light His divine love and the sense emotions which accompany it; that is, desire, joy, weakness, fear and anger, as shown by His face, words or gesture. The face of our adorable Savior was especially the guide, and a kind of faithful reflection, of those emotions which moved His soul in various ways and like repeating waves touched His Sacred Heart and excited its beating. For what is true of human psychology and its effects is valid here also. The Angelic Doctor, relying on ordinary experience, notes: "An emotion caused by anger is conveyed to the external members, and particularly to those members in which the heart's imprint is more obviously reflected, such as the eyes, the face, and the tongue."(51)
Source: Haurietis Aquas (Vatican.va)