The song "Eres Lo Mejor" by Espinoza Paz talks about unexpected love and how the person he sings to has become the best thing that has happened to him. The lyrics express his delight in having this person in his life, stating that they are exactly who he had imagined and dreamed of. He is elated to have them in his arms and wants the world to know that he loves them. The lyrics also mention that he would give his life for their love and that they are a blessing from God. The song continues to describe how this person is the best thing that has ever happened to him and compares them to a gift he had been waiting for, emphasizing that he was struck by love just like when Cupid shot his arrow. The lyrics express gratitude for their presence, calling them the best thing, thanking them for bringing joy into his life. The singer acknowledges that there is no way to repay the love and happiness they bring him. Overall, "Eres Lo Mejor" is a heartfelt expression of love and appreciation for a person who has unexpectedly entered the singer's life and has become the best and most cherished part of it.