Fifthly, so far as a man is spiritual, so far is light delightful to him. He is willing to see anything amiss that he may reform, and any further service discovered that he may perform, because he truly hates ill and loves good. If he goes against light discovered, he will soon be reclaimed, because light has a friendly party within him. Therefore, at a little sight of his error, he is soon open to counsel, as David was in his intention to kill Nabal; and he blessed God afterwards, when he was stopped in an ill way (1 Samuel 25:32). 

   In the case of a carnal man, the light breaks in on him, but he labors to block its entrance. He has no delight in coming to the light. It is impossible, before the Spirit of grace has subdued the heart, that it should not sin against the light, either by resisting it, or keeping it prisoner under base lusts and burying it, as it were, in the earth, or perverting it, and so making it an agent and factor for the flesh, in searching out arguments to plead for it, or abusing that little measure of light men have, so as to keep out a greater, higher, and more heavenly light. So, at length, they make the light they have a misleading guide to utter darkness. And the reason is because the light has no friend within. The soul is in a contrary frame, and light always hinders that sinful peace that men are willing to promise themselves. 

The Bruised Reed - Richard Sibbes