By Still Waters: Lyrical Poems Old and New by A.E‪.‬

According to Wikipedia: "George William Russell (10 April 1867 – 17 July 1935) who wrote under the pseudonym Æ (sometimes written AE or A.E.), was an Irish nationalist, writer, editor, critic, poet, and painter. He was also a mystical writer, and centre of a group of followers of theosophy in Dublin, for many years."