St Bernard of Clairvaux on the power of the name of Jesus (from his sermon on the Canticle of Canticles)

"How shall we explain the world-wide light of faith, swift and flaming in its progress, except by the preaching of Jesus’ name? Is it not by the light of this name that God has called us into his wonderful light, that irradiates our darkness and empowers us to see the light: To such as we Paul says: “You were darkness once, but now you are light in the Lord. This is the name that Paul was commanded to present before kings and pagans and the people of lsrael; a name that illumined his native land as he carried it with him like a torch, preaching on all his journeys that the night is almost over, it will be daylight soon–let us give up all the-things we, prefer to do under cover of the dark; let us arm ourselves and appear in the light. Let us live decently as people do in the daytime. To every eye he was a lamp on its lamp-stand; to every place he brought the good news of Jesus, and him crucified. What a splendor radiated from that light, dazzling the eyes of the crowd, when Peter uttered the name that strengthened the feet and ankles of the cripple, and gave light to many eyes that were spiritually blind!

Did not the words shoot like a flame when he said: “In the name of Jesus Christ of Nazareth, arise and walk” But the name of Jesus is more than light, it is also food. Do you not feel increase of strength as often as you remember it? What other name can so enrich the man who meditates? What can equal its power to refresh the harassed senses, to buttress the virtues, to add vigor to good and upright habits, to foster chaste affections? Every food of the mind is dry if it is not dipped in that oil; it is tasteless if not seasoned by that salt. Write what you will, I shall not relish it if unless it tells of Jesus.

Talk or argue about what you will, I shall not relish it if you exclude the name of Jesus. Jesus to me is honey in the mouth, music in the ear, a song in the heart.

Again, it is a medicine. Does one of us feel sad? Let the name of Jesus come into his heart, from there let it spring to his mouth, so that shining like the dawn it may dispel all darkness and, make a cloudless sky. Does someone fall into sin? Does his despair even urge him to suicide Let him but invoke this life-giving name and his will to live will be at once renewed. The hardness of heart that is our common experience, the apathy bred of indolence, bitterness of mind, repugnance for the things of the spirit-have they ever failed to yield in presence of that saving name The tears dammed up by the barrier of our pride-how have they not burst forth again with sweeter abundance at the thought of Jesus’ name?

And where is the man, who, terrified and trembling before impending peril, has not been suddenly filled with courage and rid of fear by calling on the strength of that name? Where is the man, who, tossed on the rolling seas of doubt, did not quickly find certitude by recourse to the clarity of Jesus’ name? Was ever a man so discouraged, so beaten down by afflictions, to whom the sound of this name did not bring new resolve? In short, for all the ills and disorders to which flesh is heir, this name is medicine. For proof we have no less than his own promise: “Call upon me in the day of trouble; I will deliver you, and you shall glorify me.” Nothing so curbs the onset of anger, so allays the upsurge of pride. It cures the wounds envy, controls unbridled extravagance, and quenches the flame of lust; it cools the thirst of covetousness and banishes the itch of unclean desire. For when I name Jesus I set before me a man who is meek and humble of heart, kind, prudent, chaste, merciful, flawlessly upright and holy in the eyes of all; and this same man is the all-powerful God whose way of life heals me, whose support is my strength. All these re-echo for me at the hearing of Jesus’ name. Because he is man I strive to imitate him because of his divine power lean upon him. The examples of his human life I gather like medicinal herbs; with the aid of his power I blend them, and the result is a compound like no pharmacist can produce.

Hidden as in a vase, in this name of Jesus, you, my soul, possess a salutary remedy against which no spiritual illness will be proof. Carry it always close to your heart, always in your hand, and so ensure that all your affections, all your actions, are directed to Jesus. You are even invited to do this: “Set me as a seal,” he says, “upon your heart, as a seal upon your arm.” Here is a theme we shall treat of again. For the moment you have this ready medicine for heart and hand. The name of Jesus furnishes the power to correct your evil actions, to supply what is wanting to imperfect ones; in this name your affections find a guard against corruption, or if corrupted, a power that will make them whole again." ~ St Bernard of Clairvaux