Don't hate the arising of thoughts or stop the thoughts that do arise. Simply realize that our original mind, right from the start, is beyond thought, so that no matter what, you never get involved with thoughts. Illuminate original mind, and no other understanding is necessary.
When you walking along naturally, you're walking in the harmony of the Unborn.
In criticizing, the teacher is hoping to teach. That's all.
Deep down, fundamentally, we are the 'unborn'. We never came into being and we never go out of being. All of these coming and goings are just pulses in the pattern