How to pray for open hearts?

Was not there something in the vanished time that was called the Lord's Prayer, beginning—Our Father, a well of blessing to those who opened their hearts to it? 

Surely I seem to remember, but vainly I try to call back the words—they seem to hover about me as though I need but say Our Father, and all the rest must follow. I try and say so, but never get beyond—I have sometimes repeated these two words ten, twenty times, but it is quite hopeless—they are empty and meaningless—I have lost the prayer—it is all nothing to me. I just remember that there is a Father, but He is not my Father and I am not His child. Yet I cannot refrain from racking my spirit for the once blessed words—surely they are somewhere—somewhere! 

My soul is thirsting and there is not a drop of water to cool my tongue.

Letters from Hell