“Mendicants, don’t think up a bad, unskillful idea. For example: the cosmos is eternal, or not eternal, or finite, or infinite; the soul and the body are one and the same, or the soul is one thing, the body another; after death, a realized one still exists, or no longer exists, or both still exists and no longer exists, or neither still exists nor no longer exists. Why is that? Because those thoughts aren’t beneficial or relevant to the fundamentals of the spiritual life. They don’t lead to disillusionment, dispassion, cessation, peace, insight, awakening, and extinguishment.

When you think something up, you should think: ‘This is suffering’ … ‘This is the origin of suffering’ … ‘This is the cessation of suffering’ … ‘This is the practice that leads to the cessation of suffering’. Why is that? Because those thoughts are beneficial and relevant to the fundamentals of the spiritual life. They lead to disillusionment, dispassion, cessation, peace, insight, awakening, and extinguishment.

That’s why you should practice meditation …”

Linked Discourses 56.9 1. Immersion Arguments

“Mendicants, don’t get into arguments, such as: ‘You don’t understand this teaching and training. I understand this teaching and training. What, you understand this teaching and training? You’re practicing wrong. I’m practicing right. I stay on topic, you don’t. You said last what you should have said first. You said first what you should have said last. What you’ve thought so much about has been disproved. Your doctrine is refuted. Go on, save your doctrine! You’re trapped; get yourself out of this—if you can!’ Why is that? Because those discussions aren’t beneficial or relevant to the fundamentals of the spiritual life. They don’t lead to disillusionment, dispassion, cessation, peace, insight, awakening, and extinguishment.