A man who is worth anything can no more be entirely impartial in speaking of the bird songs with which from his earliest childhood he has been familiar than he can be entirely impartial in speaking of his own family.
 Theodore Roosevelt, Theodore Roosevelt; an Autobiography (1913). copy citation

Context

“It is hard to tell just how much of the attraction in any bird-note lies in the music itself and how much in the associations. This is what makes it so useless to try to compare the bird songs of one country with those of another. A man who is worth anything can no more be entirely impartial in speaking of the bird songs with which from his earliest childhood he has been familiar than he can be entirely impartial in speaking of his own family. At Sagamore Hill we love a great many things—birds and trees and books, and all things beautiful, and horses and rifles and children and hard work and the joy of life. We have great fireplaces, and in them the logs roar and crackle during the long winter evenings.” source