On November 27, 1830, Our Lady gave the Miraculous Medal to St. Catherine Laboure, promising great graces to those who wear it.
Catherine saw Our Lady standing on a globe, with dazzling rays of light streaming from her outstretched hands. Framing the figure was an inscription: “O Mary, conceived without sin, pray for us who have recourse to thee.” Then Mary spoke to Catherine: “Have a medal struck upon this model. Those who wear it will receive great graces, especially if they wear it around the neck.” - Story of the Miraculous Medal
I have no other recourse than you ... O Mary, conceived without sin, pray for us who have recourse to you. I am alone and afflicted, I have no one but you.