「不生煩惱莫疑心」：什麼事情也不要生煩惱， Everything's okay! No problem ；莫疑心，不要這也懷疑，那也懷疑的。
I once mentioned these few phrases:
"Do not give rise to afflictions or doubts." No matter what, don't get afflicted. Everything's okay! No problem. You should not have doubts either. Don't doubt this and that.
"Always watch over yourself and don't meddle in other people's business." You should always watch over yourself. Even though I'm your teacher, I still watch over myself. If you create offenses or mistakes, I consider them my own because it shows that I haven't taught you well. I don't blame you since I didn't do my best to teach you. We should always watch over ourselves. "To overcome our desires and return to propriety" is the same as not meddling in others' business.
"Acknowledge your own faults and don't dispute over them." You should admit your faults. Don't argue with people no matter what mistake you make.
"When you are peaceful and pure, wisdom will manifest." If your conscience is clear, you will not have any external or internal trouble.
"One who understands his mind will have no obstructions." A person who comprehends the workings of his mind will not experience difficulties. He won't say, "Oh! This made me extremely upset!" Everything will become easy. Since the Dharma and the world are just as they are, there's nothing strange or difficult. What does it mean to understand your mind? It means everything is easy.
"How can someone who perceives his nature be anxious?" If you can perceive your inherent nature, there's nothing to worry about. When it's time for you to die or live, you just accept it. What's the problem? Why take it so seriously? Thus, you will have no worries.
"The Buddha's light shines universally." When the Buddha's light fails to manifest within people's minds, it is because "the mind is perturbed by worry, resentment, and enmity." Why are you not enlightened yet? Since you left the home-life at a young age, you should be enlightened and have no more hatred. Nevertheless, you still get angry when people call you an opportunist. How can you cultivate the Way if you're like that?
Thus, in cultivating the Way, one should:
"Watch over yourself in every move." You ought to reflect upon yourself in every action.
"Walking, standing, sitting, and lying down, do not leave your true origin." Do not entertain random thoughts as you walk, stand, sit, or recline. If you don't entertain random thoughts, you are not apart from your origin.