My heart leaps up when I behold A rainbow in the sky: So was it when my life began; So is it now I am a man.
"My Heart Leaps Up When I Behold" l. 1 (1807). Wordsworth also used the last three lines as the epigraph for his poem "Ode: Intimations of Immortality from Recollections of Early Childhood" (1807). See Milton 43
