Here you will find the Poem A Prayer For Old Age of poet William Butler Yeats
GOD guard me from those thoughts men think In the mind alone; He that sings a lasting song Thinks in a marrow-bone; From all that makes a wise old man That can be praised of all; O what am I that I should not seem For the song's sake a fool? I pray -- for word is out And prayer comes round again -- That I may seem, though I die old, A foolish, passionate man.