Donot be a willing horse:

As we all know In olden days people used to go from one place to another on the backs of horses.They used to load the things on horses.Most of the time they are overloaded by their masters or owners.So only they are called as beast of burdens,Domesticated and fame horses never refuse their masters for overloading them.The bad masters also show no sympathy for those animals which can not speak.The masters use full advantage of these horses.They have a wrong thinking that if the horse is not refusing it means that he is willing to do all that for his master.Every horse has it's own wish