There is a battle for our minds.
Sinful thoughts are like birds flying overhead. We cannot stop birds from flying overhead, but it is our fault if we let them nest in our hair (Martin Luther said something like that).
The Lord wants His people to be PROACTIVE in their thought lives.
Here are a few verses to meditate upon.
This book of the law shall not depart out of thy mouth; but thou shalt meditate therein day and night, that thou mayest observe to do according to all that is written therein: for then thou shalt make thy way prosperous, and then thou shalt have good success.
Joshua 1:8 (KJV)
Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things.
Philippians 4:8 (KJV)
Thy word have I hid in mine heart, that I might not sin against thee.
Psalms 119:11 (KJV)
Casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ;
2 Corinthians 10:5 (KJV)
Beware that there be not a thought in thy wicked heart, saying, The seventh year, the year of release, is at hand; and thine eye be evil against thy poor brother, and thou givest him nought; and he cry unto the LORD against thee, and it be sin unto thee.
Deuteronomy 15:9 (KJV)
The wicked, through the pride of his countenance, will not seek after God: God is not in all his thoughts.
Psalms 10:4 (KJV)
Let the wicked forsake his way, and the unrighteous man his thoughts: and let him return unto the LORD, and he will have mercy upon him; and to our God, for he will abundantly pardon.
Isaiah 55:7 (KJV)
Their feet run to evil, and they make haste to shed innocent blood: their thoughts are thoughts of iniquity; wasting and destruction are in their paths.
Isaiah 59:7 (KJV)
O Jerusalem, wash thine heart from wickedness, that thou mayest be saved. How long shall thy vain thoughts lodge within thee?
Jeremiah 4:14 (KJV)
For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:
Matthew 15:19 (KJV)
Who by the mouth of thy servant David hast said, Why did the heathen rage, and the people imagine vain things?
Acts 4:25 (KJV)
Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
Romans 1:21 (KJV)
For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.
Hebrews 4:12 (KJV)