“Bhikkhus, I say that the destruction of the taints is for one who knows and sees, not for one who does not know and does not see. For one who knows what, for one who sees what, does the destruction of the taints come about? The destruction of the taints comes about for one who knows and sees: ‘This is suffering’; for one who knows and sees: ‘This is the origin of suffering’; for one who knows and sees: ‘This is the cessation of suffering’; for one who knows and sees: ‘This is the way leading to the cessation of suffering.’ It is for one who knows thus, for one who sees thus, that the destruction of the taints comes about.
“Therefore, bhikkhus, an exertion should be made to understand: ‘This is suffering.’… An exertion should be made to understand: ‘This is the way leading to the cessation of suffering.’”