No horse is so good, but that he will at times stumble. (Latin Proverb)
Urge the horse close to the turning-post. [Don't let him run side; keep to the point in question.] (Latin Proverb)
To remove the hairs from a horse's tail, one by one must be plucked out. [Small persevering efforts succeed, when violent measures would fail.] (Latin Proverb)