Here are Bible verses about thoughts.

Finally, brothers, whatever is true, whatever is honorable, whatever is just, whatever is pure, whatever is lovely, whatever is commendable, if there is any excellence, if there is anything worthy of praise, think about these things.- Philippians 4:8

We destroy arguments and every lofty opinion raised against the knowledge of God, and take every thought captive to obey Christ,- 2 Corinthians 10:5

For the word of God is living and active, sharper than any two-edged sword, piercing to the division of soul and of spirit, of joints and of marrow, and discerning the thoughts and intentions of the heart.- Hebrews 4:12

I appeal to you therefore, brothers, by the mercies of God, to present your bodies as a living sacrifice, holy and acceptable to God, which is your spiritual worship. Do not be conformed to this world, but be transformed by the renewal of your mind, that by testing you may discern what is the will of God, what is good and acceptable and perfect.- Romans 12:1-2

Let the words of my mouth and the meditation of my heart be acceptable in your sight, O Lord, my rock and my redeemer.- Psalm 19:14

Keep your heart with all vigilance, for from it flow the springs of life.- Proverbs 4:23

Do not be anxious about anything, but in everything by prayer and supplication with thanksgiving let your requests be made known to God.- Philippians 4:6

The good person out of the good treasure of his heart produces good, and the evil person out of his evil treasure produces evil, for out of the abundance of the heart his mouth speaks.- Luke 6:45