At Sāvatthī.

“Mendicants, develop immersion. A mendicant who has immersion truly understands. What do they truly understand? They truly understand: ‘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’. Develop immersion. A mendicant who has immersion truly understands.

That’s why you should practice meditation to understand: ‘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’.”