Training an ox requires great patience. If your ox wanders off to eat grass, what should you do? Should you kill it? No, you patiently pull it back to its work, as often as necessary. You should never get upset with yourself if your mind wanders off the method, or if you're not practicing properly. Just catch yourself, and be aware of the digression. This very awareness is proper practice. This is watching the ox. Training the mind is like training a wild ox, only harder.