Hebrews 3:12 (KJV) 12 Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.
We as believers—those of us who are a part of God’s family—need to pay sincere and serious attention, and need to be very careful. Not doing so results to the terrible condition of having “an evil heart of unbelief”—hearts that become hardened through continuous conscious decisions and actions of disobedience and rebellion—which inevitably leads to departure from the living God.
This Scripture is a point of contention among believers despite the clarity of the statement. But instead of adding to an already excessive arguments and counter-arguments from both sides of interpretation, I choose to just do what the Scripture directs us to do—to heed the encouragement and warning.
We want to be careful and not careless. We have an internal enemy—the flesh, and we have external enemies—the world and the devil. They want to creep in and devour us completely. We’d rather live as more than conquerors than live as the conquered. We want to have good, believing hearts instead of evil, unbelieving, doubtful, confused, hardened, and calloused hearts. We want to abide in God instead of departing from Him. We strive to fight the good fight, to run our race well, and to keep the faith.