This is from a sonnet written on the birthday of his father, John Adams, six months after his death. It can be found in the /Memoirs of John Quincy Adams/ Vol VII (http://bit.ly/2fulMsH), p 164. In the original manuscript (http://bit.ly/2fuibem), the sonnet is in shorthand “that it may only be legible to myself, or to a reader who will take the trouble to pick it out.”