The heart is true to the demands placed on it. Surely no one would be foolish enough in natural things to argue with you when you turn the thermostat to 70 degrees, but they will when you set your goal on God’s promises.

Hope, like a thermostat, is simply a goal-setter with no substance. Faith, which comes from the heart, is the substance of what you desire.
The heart (spirit) of man is like the heart of the heating-cooling unit, designed by God to produce the very thing you plant in it. You plant it or set the goal by speaking it!