If Heaven and Earth are unable to persist, how could man?
Returning to the source is serenity.
He who knows does not speak. He who speaks does not know.
To manage your mind, know that there is nothing, and then relinquish all attachment to nothingness.
Those who boast are not respected.
If you close your mind in judgements and traffic with desires, your heart will be troubled. If you keep your mind from judging and aren't led by the senses, your heart will find peace.