God's grace at the Interpreter's House

The Pilgrim's Progress is filled with fantastic illustrations of the Christian life. Here is one from my morning devotions.

Then I saw in my dream that the Interpreter took Christian by the hand, and led him into a place where was a fire burning against a wall, and one standing by it, always casting much water upon it to quench it; yet did the fire burn higher and hotter. 

Then said Christian, What means this? 

The Interpreter answered, This fire is the work of grace that is wrought in the heart; he that casts water upon it to extinguish and put it out is the devil; but in that thou seest the fire, notwithstanding, burn higher and hotter, thou shalt also see the reason of that. So he had him about to the backside of the wall, where he saw a man with a vessel of oil in his hand, of the which he did also continually cast (but secretly) into the fire. 

Then said Christian, What means this? 

The Interpreter answered, This is Christ, who continually, with the oil of His grace, maintains the work already begun in the heart; by the means of which, notwithstanding what the devil can do, the souls of His people prove gracious still. And in that thou sawest that the man stood behind the wall to maintain the fire: this is to teach thee, that it is hard for the tempted to see how this work of grace is maintained in the soul.

When we feel as if the situations of life are getting too burdensome, and we feel like we cannot persist any longer, God's grace shows up in the unseen ways and proves to be sufficient for us.