No word is oftener on the lips of men than Friendship, and indeed no thought is more familiar to their aspirations.
 Henry David Thoreau, A Week on the Concord and Merrimack Rivers (1849). copy citation

Context

“They speak faintly, and do not obtrude themselves. They have heard some news, which none, not even they themselves, can impart. It is a wealth they can bear about them which can be expended in various ways. What came they out to seek? No word is oftener on the lips of men than Friendship, and indeed no thought is more familiar to their aspirations. All men are dreaming of it, and its drama, which is always a tragedy, is enacted daily. It is the secret of the universe. You may thread the town, you may wander the country, and none shall ever speak of it, yet thought is everywhere busy about it, and the idea of what is possible in this respect affects our behavior toward all new men and women, and a great many old ones.” source