"How did you know" by Gary Valenciano is a heartfelt love song that tells the story of how someone unexpectedly came into the singer's life and brought immense happiness and love. The song highlights the feeling of finding the perfect person at the right time, filling a void in the singer's heart. The lyrics convey the narrator's astonishment and gratitude, as they reflect on the day this person entered their life. The singer acknowledges the immediate connection and the positive impact it had on their well-being. With this person by their side, the singer feels that everything will work out fine. The singer wonders how this person knew that they needed someone like them in their life. The presence of this individual filled an empty space in the singer's heart, arriving precisely when they needed it the most. The singer emphasizes that this person brought light and warmth to their life, eradicating worries and fears that once plagued them. The narrator concludes by expressing their deep and indescribable love for this person. They acknowledge that it is rare to find someone like them, and words cannot adequately articulate the depth of their affection. In summary, "How did you know" is a song about the serendipitous arrival of love and the transformative power it has on an individual's life. It celebrates the unique bond shared with someone who comes into our lives at the perfect moment, bringing joy, healing, and unconditional love.