Example is better than precept.
THE ASS AND HIS SHADOW
A certain man hired an Ass for a journey in summertime, and started out with the owner following behind to drive the beast. By and by, in the heat of the day, they stopped to rest, and the traveller wanted to lie down in the Ass's Shadow; but the owner, who himself wished to be out of the sun, wouldn't let him do that; for he said he had hired the Ass only, and not his Shadow: the other maintained that his bargain secured him complete control of the Ass for the time being. From words they came to blows; and while they were belabouring each other the Ass took to his heels and was soon out of sight.
THE FARMER AND HIS SONS
A Farmer, being at death's door, and desiring to impart to his Sons a secret of much moment, called them round him and said, "My sons, I am shortly about to die; I would have you know, therefore, that in my vineyard there lies a hidden treasure. Dig, and you will find it." As soon as their father was dead, the Sons took spade and fork and turned up the soil of the vineyard over and over again, in their search for the treasure which they supposed to lie buried there. They found none, however: but the vines, after so thorough a digging, produced a crop such as had never before been seen.