Why Am I Silent?

Why am I silent? Tell me how to speak With all the sweet familiars of the way; Call Summer by her name; and with the Day Walk royally companioned cheek on cheek For that faint speech awhile withheld, that weak Task of the Word undone is the great Nay, The winged thunder that denies the ray. Yet once when first I saw the hapless Greek By present impulse of the god urged on Seek out the shadow of the awful grove, I felt the word. I caught it once again In a sweet flash of arrowy sun that shone Thickening on flowers. But when You sorrowed, Love, I knew it then....