The heart of man is a short word, a small substance, scarce enough to give a kite a meal, yet great in capacity; yea, so indefinite in desire that the round globe of the world cannot fill the three corners of it. When it desires more and cries, "Give, give," I will set it over to the infinite good, where the more it hath, it may desire more, and see more to be desired.
The human heart is like the millstone in a mill; when you put wheat under it, it turns and grinds the wheat into flour. If you put no wheat in, it still grinds on, but then it is itself it grinds and slowly wears away.
If your heart takes more pleasure in reading novels, or watching TV, or going to the movies, or talking to friends, rather than just sitting alone with God and embracing Him, sharing His cares and His burdens, weeping and rejoicing with Him, then how are you going to handle forever and ever in His presence? You'd be bored to tears in heaven, if you're not ecstatic about God now! - Keith Green