What other words, we may almost ask, are memorable and worthy to be repeated than those which love has inspired? It is wonderful that they were ever uttered. They are few and rare, indeed, but, like a strain of music, they are incessantly repeated and modulated by the memory.
 Henry David Thoreau, A Week on the Concord and Merrimack Rivers (1849). copy citation

Context

“that discovers a new world, fair and fresh and eternal, occupying the place of the old one, when to the common eye a dust has settled on the universe? which world cannot else be reached, and does not exist. What other words, we may almost ask, are memorable and worthy to be repeated than those which love has inspired? It is wonderful that they were ever uttered. They are few and rare, indeed, but, like a strain of music, they are incessantly repeated and modulated by the memory. All other words crumble off with the stucco which overlies the heart. We should not dare to repeat these now aloud. We are not competent to hear them at all times.
The books for young people say a great deal about the selection of Friends; it is because they really have nothing to say about Friends.” source