Of what use the friendliest dispositions even, if there are no hours given to Friendship, if it is forever postponed to unimportant duties and relations? Friendship is first, Friendship last. But it is equally impossible to forget our Friends, and to make them answer to our ideal.
 Henry David Thoreau, A Week on the Concord and Merrimack Rivers (1849). copy citation

Context

“We never exchange more than three words with a Friend in our lives on that level to which our thoughts and feelings almost habitually rise. One goes forth prepared to say, “ Sweet Friends! ” and the salutation is, “ Damn your eyes! ” O my Friend, may it come to pass once, that when you are my Friend I may be yours.
Of what use the friendliest dispositions even, if there are no hours given to Friendship, if it is forever postponed to unimportant duties and relations? Friendship is first, Friendship last. But it is equally impossible to forget our Friends, and to make them answer to our ideal. When they say farewell, then indeed we begin to keep them company. How often we find ourselves turning our backs on our actual Friends, that we may go and meet their ideal cousins. I would that I were worthy to be any man’s Friend.
source