Believe by Justin Bieber is a motivational and uplifting song that emphasizes the power of believing in oneself. The key themes of this song include self-empowerment, perseverance, and the strength to overcome challenges. The lyrics encourage listeners to trust in their own abilities and dreams, suggesting that belief is a crucial factor in achieving success. Poignant moments in the song include references to personal growth and resilience, making listeners feel inspired to strive for their aspirations despite obstacles.