OUTLINE:

Only God's wisdom from God's Word can protect your heart from deception.

Beware Where You Turn
Keep your nose in the Word of God, and keep busy with good things from the Lord.

Biblestudytools.com
"Heart" (Hebrew lebab/leb, Gk. kardia) occurs over one thousand times in the Bible, making it the most common anthropological term in the Scripture. It denotes a person's center for both physical and emotional-intellectual-moral activities; sometimes it is used figuratively for any inaccessible thing.

Biblestudytools.com
The heart's reasoning, as well as its feeling, depends on its moral condition. Jesus said that "from within, out of men's hearts, come evil thoughts" (Mark 7:21). Because the human heart is deceitful above all things (Jer 17:9) and folly is bound up in the heart of a child (Prov 22:15), the Spirit of God must give humans a new heart (Jer 31:33 ; Ezek 36:26) through faith that purifies it (Acts 15:9 ; cf. Eph 3:17).

Biblestudytools.com
The heart functions as the conscience. After David showed insubordination against the anointed king by cutting off the corner of his robe, his heart smote him (1 Sam 24:5), and after Peter's sermon the audience was "cut to the heart" (Acts 2:37). The heart may condemn us, but God is greater than our hearts (1 John 3:20). David prays that God would create for him a pure heart to replace his defiled conscience (Psalm 51:10).

How The Heart Works
This is all supernatural stuff!!!... how the heart and mind and conscience function together in a spiritual fashion cannot be put on a road map. We are talking about a supernatural spiritual function that the Lord has provided to us and for us.

Biblestudytools.com
The greatest commandment according to Jesus is "Love the Lord your God with all your heart" (Matt 22:37). Love here is more than emotion; it is a conscious commitment to the Lord.

2Pe 3:17
Peter is warning us to “be on guard” against the presence of false doctrines from unprincipled/lawless men who have given in to the lusts of their flesh.

A Spiritual Tug of War

"Wally Cleaver's Nose"
The very best the flesh can hope for in its dwindling plight is to influence our perspective, to get a believer’s attention diverted to unholy standards set up to ultimately keep us in bondage to the opinions of man.

1Co 4:5
Therefore do not go on passing judgment before the time, but wait until the Lord comes who will both bring to light the things hidden in the darkness and disclose the motives of men’s hearts; and then each man’s praise will come to him from God.

Jer 15:19c
They for their part may turn to you, but as for you, you must not turn to them.

"Turning" in Salvation
The unbeliever must turn away from sin/self and turn towards Christ in his heart. And this true turning will also have certain good deeds resulting. Mar 1:15, Luk 9:23, Rom 10:9-10

"Turning" in the Spiritual Walk
Repentance and faith are the daily way to walk with God, to be delivered daily from sin and death, experientially.