Riding Recollections, 5th ed‪.‬

As in the choice of a horse and a wife a man must please himself, ignoring the opinion and advice of friends, so in the governing of each it is unwise to follow out any fixed system of discipline. Much depends on temper, education, mutual understanding and surrounding circumstances. Courage must not be heated to recklessness, caution should be implied rather than exhibited, and confidence is simply a question of time and place. It is as difficult to explain by precept or demonstrate by example how force, balance, and persuasion ought to be combined in horsemanship, as to teach the art of floating in the water or swimming on the back.