The importance of aligning behavior with beliefs is emphasized in Gospel of Matthew, chapter six, verses 19 to 23. The passage compares the concept of treasure with personal development, time, and money. It questions the alignment of beliefs with actions and stresses the need for behavior to reflect one's beliefs. Believers are encouraged to reflect their faith in their behavior and strive for improvement if there is a misalignment. Personal reflection on aligning behavior with beliefs is highlighted in this passage.