Benedictine nun Saint Mechtilde (1241-1298), belonged to the family of Hackborn and was born in 1241. She had a great devotion to the Sacred Heart of Jesus Christ.

Whenever our Lord appeared to her she nearly always received some special favour from His Heart. She often loved to say: “If all the graces that have come to me from the Sacred Heart of Jesus were written down, a book larger than a Breviary would not suffice in which to narrate them.” ( Love of the Sacred Heart, illustrated by Saint Mechtilde)

Mechtilde asked our Lord to teach her how she could offer satisfaction to Him for the many members of the Church who at this time (it was Quinquagesima Sunday) showered so many insults on Him. Our Lord replied: “Say 350 times the anthem: Tibi laus, tibi gloria, tibi gratiarum actio, beata Trinitas! – ‘To you be praise, to you glory, to you thanksgiving, O blessed Trinity,’ in reparation for all the indignities offered Me by those who are My members.” (Love of the Sacred Heart, illustrated by Saint Mechtilde)

We see, therefore, that already Mechtilde was intent on offering reparation for the sins of others. But, above all others, she thought of her own sins. One day when she was grieving over the uselessness of her past life, she offered herself to live if possible in ceaseless sorrow and to suffer on earth to the uttermost. (Love of the Sacred Heart, illustrated by Saint Mechtilde)

Our Lord said to her: “To repair Your omissions and make up for the past, praise My Heart for its divine goodness. It is the source and origin of all good, and every blessing flows from it. Then praise My Heart for the numberless graces which have flowed, flow now, and shall for ever flow, on all the Saints and on all the souls that shall be saved. Afterwards praise My Heart for all the sweetness which, so many times, has sprung from My loving Heart and flowed into thine, intoxicating it with heavenly delight. (Love of the Sacred Heart, illustrated by Saint Mechtilde)

Book Source: Love of the Sacred Heart, illustrated by Saint Mechtilde