Trust by Justin Bieber is a song about the importance of trust in a relationship. In this track, Bieber emphasizes how crucial it is to have mutual trust and understanding with one's partner in order to maintain a healthy and loving relationship. The key themes revolve around faith, reliability, and emotional security between partners. Poignant moments in the song include lyrics where Bieber expresses vulnerability and a deep need for his partner's trust, highlighting how trust forms the foundation for love and intimacy.