John of God, who was born in Portugal in 1495, started off as a soldier and became a medical worker later in Spain. His followers founded a medical organization called the Brothers Hospitallers of Saint John of God in 1572 and they carry out their work to this day.
St. John of God who was canonized by the Catholic Church is the patron saint of heart diseases. Working as a soldier until age 40, John later became a shepherd. With time to himself to think, he realized he was a great sinner and decided to amend his life. At first he was going to go help Christians in Muslim countries, but was convinced not to do that after hearing a great speech by St. John of Avila. John of God had great zeal for proclaiming God's message, but he was somewhat out of control and ended up in a mental asylum. While in the asylum, he was visited by John of Avila who counselled him to control himself and start a hospital, which he did, once again with great energy. John of God was known for his humility and dedication to the sick.
One particular source has an amazing story of John's humility. Here is one quote I found particularly moving:
In the beginning John went begging for money to support these poor, but soon people came to give him alms, food, and supplies because they were so impressed with his charity. Once when a fire broke out in the house, John ran back into the burning building countless times, carrying the sick out on his back. Unemployed men came to the door, and he found them work. When the archbishop called John to his office because people complained that John kept tramps and immoral women in his hospital, he was silenced by John's humility. John fell on his knees, saying, "I know of no bad person in my hospital except myself, who am unworthy to eat the bread of the poor." Another bishop who invited John to supper was so impressed by his humility that he called him John of God.
A recent development in this whole story is a new person who also calls himself John of God located in Brazil. His real name is João Teixeira de Faria. He mixes in a lot of traditional Catholicism with his brand of mysticism, New Ageism, and mediumship. I looked it up on Youtube and there was a video by Oprah where she visits his facility. Some Northern European guy was profiled who had back issues, so he visited this medium calling himself John of God. John made an incision in the man's chest (without anesthetic) while the man remained standing. It caused bleeding and he was then brought to a recovery room. The man felt the procedure had helped him.
I think it's best to keep our prayers with the traditional John of God. He is the patron saint of heart problems and diseases. Please feel free to share your stories or place your prayer intentions for a family member or friend who may have heart issues. This may be a brother, sister, mother, father, wife, husband, son, or daughter. Perhaps it's a coworker.
Ask St. John of God for his intercession. This doesn't mean the saint has magical powers on his own. Rather St. John will join his prayers with your own toward God.
Here is a prayer you can recite toward John of God (originally found here):
Saint John of God, I honor thee as the Patron of the Sick, especially of those who are afflicted by heart disease. I choose thee to be my patron and protector in my present illness. To thee I entrust my soul, my body, all my spiritual and temporal interests, as well as those of the sick throughout the world. To thee I consecrate my mind, that in all things it may be enlightened by faith above all in accepting my cross as a blessing from God; my heart, that thou doth keep it pure and fill it with the love for Jesus and Mary that burned in thy heart; my will, that like thine, it may always be one with the Will of God.
Good Saint John, I honor thee as the model of penitents, for thou didst receive the grace to give up a sinful life and to atone for thy sins by untiring labors in behalf of the poor and sick. Obtain for me the grace from God to be truly sorry for my sins, to make atonement for them and never again offend God. Aid me in mastering my evil inclinations and temptations, and in avoiding all occasions of sin. Through thine intercession may I obtain the grace from Jesus and Mary to fulfill faithfully all the duties of my state of life and to practice those virtues which are needful for my salvation. Help me to belong to God and Our Lady in life and in death through perfect love. May my life, like thine, be spent in the untiring service of God and my neighbor.
Since Holy Mother Church also invokes thee in her prayers for the dying, I beg thee to be with me in my last hour and pray for me. As thou didst die kneeling before a crucifix, may I find strength, consolation and salvation in the Cross of my Redeemer, and through His tender mercy and the prayers of Our Lady, and through thine intercession, attain to eternal life. Amen.
Peace be with you, friends.