Even the utmost good-will and harmony and practical kindness are not sufficient for Friendship, for Friends do not live in harmony merely, as some say, but in melody.
 Henry David Thoreau, A Week on the Concord and Merrimack Rivers (1849). copy citation

Context

“but he who foresees such advantages in this relation proves himself blind to its real advantage, or indeed wholly inexperienced in the relation itself. Such services are particular and menial, compared with the perpetual and all-embracing service which it is. Even the utmost good-will and harmony and practical kindness are not sufficient for Friendship, for Friends do not live in harmony merely, as some say, but in melody. We do not wish for Friends to feed and clothe our bodies,—neighbors are kind enough for that,—but to do the like office to our spirits. For this few are rich enough, however well disposed they may be.” source