A hardened heart is to be feared above all. For when your heart becomes darkened you cannot see the light. You begin to spiral downward, falling into deep deception. You must keep your heart pure by meditating on My Word. Allow My light to expose all lies of the enemy. Walk in the light where you can see clearly. Sin for the moment seems pleasurable. It caters to the flesh. You must be merciless against the enemy of your soul. Put up a NO TRESPASSING sign. Small lies give way to the big, leading to a path of destruction. Many of My children have strayed on this path. Remember that it only takes a mustard seed of faith to move mountains. Return to childlike faith and keep your heart tender.
Colossians 2:8 Amplified Bible, Classic Edition (AMPC)
See to it that no one carries you off as spoil or makes you yourselves captive by his so-called philosophy and intellectualism and vain deceit (idle fancies and plain nonsense), following human tradition (men’s ideas of the material rather than the spiritual world), just crude notions following the rudimentary and elemental teachings of the universe and disregarding [the teachings of] Christ (the Messiah).
Hebrews 3:12-13 Living Bible (TLB)
12 Beware then of your own hearts, dear brothers, lest you find that they, too, are evil and unbelieving and are leading you away from the living God. 13 Speak to each other about these things every day while there is still time so that none of you will become hardened against God, being blinded by the glamor of sin.