The singing of birds,
A warbling band,
And flowers, are words
Which even a babe may understand.
Source, in full
"The Winter is over and gone at Last", st. 2. Frank Foxcroft (ed.) Resurgit: A Collection of Hymns and Songs of the Resurrection (Boston: Lee and Shepard; New York: Charles T. Dillingham, 1879), p. 323. Often paraphrased: "Flowers are words which even a baby can understand."