A tender heart quickly and readily yields when offered correction; however, as a heart becomes hardened, the times of yielding become fewer and farther apart. During the hardening process, the individual finds the true nature of the heart more difficult to grasp. As the heart further hardens, the individual finds himself involved in further defiance. The mischief may start as seemingly insignificant, but a hardening heart will ultimately lead to greater depths of wickedness, some seemingly unimaginable only a short time ago. Some of the worst sins committed in the Bible by God's people were committed by those who shortly before had displayed a tender heart. Yet, they allowed their hearts to be hardened by the deceitfulness of sin.
God knows everything about everything, yet Christians sometimes act as though He has some debilitating limitations. Once again, the Bible shines the light of truth upon the matter. It reveals that He is great, “and of great power: his understanding is infinite” (Psalm 147:5). In fact, His eyes “are in every place, beholding the evil and the good” (Proverbs 15:3). In other words, there is nothing that escapes the knowledge and attention of God. This includes the good and the bad! The Son of God proclaimed to the church at Thyatira that He knew their works, charity, service, faith, and patience. He too knows about the level of a man’s faith! He knows the content, strength, and reality of that faith. A man can and will fool others and frequently even deceives himself (Jeremiah 17:9), but he has no capacity to mislead God. The Lord knows those who believe and accept His word as the perfect word of God and He is not unrighteous to forget (Hebrews 6:10).
