Not to want to pray, then, is the sin behind sin. And it ends in not being able to pray. That is its punishment—spiritual dumbness, or at least aphasia, and starvation. We do not take our spiritual food, and so we falter, dwindle, and die. “In the sweat of your brow ye shall eat your bread.” That has been said to be true both of physical and spiritual labor. It is true both of the life of bread and of the bread of life. 

   Prayer brings with it, as food does, a new sense of power and health. We are driven to it by hunger, and, having eaten, we are refreshed and strengthened for the battle which even our physical life involves. For heart and flesh cry out for the living God. God’s gift is free; it is, therefore, a gift to our freedom, i.e. renewal to our moral strength, to what makes men of us. Without this gift always renewed, our very freedom can enslave us. The life of every organism is but the constant victory of a higher energy, constantly fed, over lower and more elementary forces. Prayer is the assimilation of a holy God’s moral strength. 

   We must work for this living. To feed the soul we must toil at prayer. 

The Soul of Prayer - P.T. Forsyth