Immediately after the Parable of the Sower, an application follows:
No one after lighting a lamp covers it with a jar or puts it under a bed, but puts it on a stand, so that those who enter may see the light. For nothing is hidden that will not be made manifest, nor is anything secret that will not be known and come to light. Take care then how you hear, for to the one who has, more will be given, and from the one who has not, even what he thinks that he has will be taken away. -Luke 8:16-18
It is convicting: “take heed then how you hear…” Hendriksen puts it this way:
In matters spiritual, standing still is impossible. A person either gains or loses; he either advances or declines … Every blessing is a guarantee of further blessings to come (John 1:16). … On the other hand, whoever does not have, from him shall be taken away even that semblance of knowledge, that superficial acquaintance with matters spiritual, which he once had or thought he had. … Is it not true that the person who has learned enough music to play a few simple melodies, but not really enough to be able to say, “I have mastered this or that instrument,” and then stops practicing altogether, will soon discover that the little skill which he had at one time has vanished? The man who refuses to make proper use of his one talent loses even that (Matt. 25:24-30).