Emmet Fox 
The Mental Equivalent (Rediscovered Books) [EPUB ebook] 
The Secret of Demonstration

There is no truth in our seeming troubles. There is no reality in lack. There is no power in time or conditions to make us old or tired or sick. The Jesus Christ teaching, and the Unity movement in particular, comes to us and says: “You are not locked in a prison of circumstances. You are not chained in any dungeon. In the name of God, turn the handle, walk out, and be free.” Build a mental equivalent of freedom, of vibrant physical health, of true prosperity, of increasing understanding and achievement for God. Build it by thinking of it, having faith in it and acting the part, and the old limitation equivalent will gradually fade out, for the door is unlocked and the voice of God in your heart says, “Be free.”