The sermon "God is Love And You Can Trust Him" highlights the foundational Christian belief that God's love is unmerited, unconditional, and unending. Through referencing various Bible verses, the speaker explains that love is an inherent attribute of God's character, manifesting in the sacrifice of Jesus Christ for humanity's sins. The sermon encourages believers to emulate this divine love in their relationships, emphasizing that true love is an act of will rather than an emotional response. It challenges listeners to love unconditionally, just as God loves us.