2 Corinthians 10:5 (AMP) 5 [Inasmuch as we] refute arguments and theories and reasonings and every proud and lofty thing that sets itself up against the [true] knowledge of God; and we lead every thought and purpose away captive into the obedience of Christ (the Messiah, the Anointed One),
Our thoughts become our actions, words and moods. You can actually think things on purpose. You don’t have to think everything that falls into your head. We can strive to replace wrong thoughts that come into our mind with positive and right thoughts.
To change our thoughts we must understand that God loves us unconditionally. We do matter and we matter very much to God. We are valuable to God.
1 John 4:16 (AMP) 16 And we know (understand, recognize, are conscious of, by observation and by experience) and believe (adhere to and put faith in and rely on) the love God cherishes for us. God is love, and he who dwells and continues in love dwells and continues in God, and God dwells and continues in him.