Emmet Fox 
The Golden Key 

Scientific Prayer will enable you, sooner or later, to get yourself, or anyone else, out of any difficulty on the face of the earth. It is the Golden Key to harmony and happiness. To those who have no acquaintance with the mightiest power in existence, this may appear to be a rash claim, but it needs only a fair trial to prove that, without a shadow of doubt, it is a just one. You need to take no one’s word for it, and you should not. Simply try it for yourself, and see.