How I Know You by Elton John is a heartfelt ballad that explores themes of love, memory, and emotional connection. The song delves into the intimate moments shared between two people, emphasizing the enduring impact those memories have on one's heart. It reflects on the tender experiences and the deep sense of knowing someone deeply, despite the passage of time. Key themes include reminiscence, emotional bonds, and the lasting imprint of love. Poignant moments in the song often revolve around specific memories captured in the lyrics, highlighting the vividness with which these experiences are remembered.