Why should Christians not worry about possessions?

In the Sermon on the Mount, Jesus teaches that worrying about material needs is counterproductive (Matthew 6:25-34). He encourages believers to seek first the Kingdom of God and His righteousness, assuring them that all these things will be added unto them. The rich man's folly illustrates the uncertainty of life and possessions—he thought he could find security in wealth, yet faced the abrupt end of his earthly life. Genuine peace comes from relinquishing our trust in material possessions and placing it wholly in God, who promises to meet our needs according to His riches in glory (Philippians 4:19).