What does the Bible say about positive thinking?

In Philippians 4:8, Paul instructs believers to think on whatever is true, honorable, just, pure, lovely, commendable, and praiseworthy. This goes beyond mere positive thinking as promoted in popular culture; it directs our minds to Christ, the embodiment of all these virtues. Unlike the empty positivity that lacks depth, biblical thinking leads to genuine peace and joy rooted in our relationship with God through Jesus Christ. The peace of God, which surpasses all understanding, keeps our hearts and minds focused on Him.