“The big artist does not sit down monkey like & copy a coal scuttle or an ugly old woman like some Dutch painters have done nor a dungpile, but he keeps a sharp eye on Nature & steals her tools. He learns what she does with light the big tool & then colour then form and appropriates them to his own use. Then he's got a canoe of his own smaller than Nature's but big enough for every purpose except to paint the midday sun which is not beautiful at all. It is plenty strong enough though to make midday sunlight or the setting sun if you know how to handle it. With this canoe he can sail parallel to Nature's sailing. He will soon be sailing only where he wants to selecting nice little coves & shady shores or storms to his own liking, but if ever he thinks he can sail another fashion from Nature or make a better shaped boat he'll capsize or stick in the mud & nobody will buy his pictures or sail with him in his old tub.”

Letter to Benjamin Eakins (1868-03-03).