“The Parable of the Sower; why did the Lord Jesus give us that parable? Why, but to stir me up to serious inquiry and diligent examination so as to discover which kind of a “hearer” I am. In that parable, Christ likened those who hear the Word unto various sorts of ground upon which seeds fall. He divided them into four different classes. Three out of the four brought no fruit to perfection. That is exceedingly solemn and searching. In one case the Devil catches away the good seed out of the heart (Luke 8:12). In another case, they “for a while believe, and in time of temptation fall away” (Luke 8:13). In another case, they are “choked with cares and riches and pleasures of this life” (Luke 8:14). Are you, my reader, described in one of these? Do not ignore this question. We beg you: face it honestly, and make sure which of the various soils represent your heart.
But there are some “good ground” hearers. And how are they to be identified? What did the infallible Son of God say of them? How did He describe them? Did He say, “that on the good ground are they who rest on the Word of God and doubt not His promises: are thoroughly persuaded they are saved, and yet go on living the same kind of life as previously”? No. He did not. Instead, He declared, “But that on the good ground are they, which in an honest and good heart, having heard the Word, keep it, and bring forth fruit with patience” (Luke 8:15). Ah, dear readers, the test is fruit: not knowledge, not boasting, not orthodoxy, not joy, but FRUIT: and such “fruit” as mere nature cannot produce. It is the fruit of the Vine, namely, likeness to Christ, being conformed to His Image. May the Holy Spirit search each one of us.”
~Arthur Pink, “The Doctrine of Assurance”