Don't be donkeys! (Psalm 32:9)

[Psa 32:9 KJV] 9 Be ye not as the horse, [or] as the mule, [which] have no understanding: whose mouth must be held in with bit and bridle, lest they come near unto thee.

The moral of this passage is DON'T BE DONKEYS!!!
With that said let me explain why. First they don't reason like us people do, and you would need to stick a metal bar in its mouth to control it. Unless it willingly goes to you, then you should take its pressure off as a reward.
We shouldn't have to be forced by God to do his will, but if you do his willingly he will bless you.
If you are stubborn  God can't use you, and the blessings will go to someone else.
What we could learn is to not be like the horse or the mule and let God freely use us to do his will.