"And Jesus said to them, 'I am the bread of life. He who comes to Me shall never hunger, and he who believes in Me shall never thirst.' "
This is a pretty outrageous claim by the Lord Jesus Christ; and it would be a horrible one, if He could not keep it. But, of course, He *does* fulfill it perfectly, in all His redeemed churchmen. But if this is so, why is it that so many professing Christians--even we ourselves at times--do not "feel" like we are always full and satisfied?
The answer: we sometimes seek both the power for and the evidence of our true spiritual life in the wrong places. The evidence is to be found in faithful churchmanship. The power comes from the proper use of the means of grace: preaching, the two sacraments, prayer, and the fellowship of the saints.
[Puritan quote of the day: "Grace is not glorious if we add the least thing of our own to it." --Richard Sibbes, in "Glorious Freedom"]