How could I convince my reading public I heard it from the horse's mouth?
The snaffle reins should be drawn up gently until the rider feels that he has an equal and light hold of his horse's mouth on both sides, with just so much pressure that the slightest movement of the left or right rein would cause him to turn to the left or right respectively.
When the horse is in motion the hands should not be held rigid, as the horse's mouth would thereby become dead, and the horse would lean unpleasantly on the hand; but the rider should give and take, without, however, entirely relaxing the hold.
In order to encourage the horse to walk the head must not be confined, but a light feeling of the horse's mouth must be kept up. Should the horse, unasked, break into a trot, never snatch at his mouth, but restrain him gently.
A rider with good hands never depends upon his reins for retaining his seat; nor does he pull at the horse's mouth so as to make him afraid to go up to his bit; nor again does he ever use more force than is necessary for the accomplishment of what he desires to perform.