At Sāvatthī. “Mendicants, there are these four meditators. What four? One meditator is skilled in immersion but not in projecting the mind purified by immersion. …”

Linked Discourses 34.8 1. Absorption Carefulness in Immersion

At Sāvatthī. “Mendicants, there are these four meditators. What four? One meditator is skilled in immersion but not in practicing carefully for it. …”

Linked Discourses 34.9 1. Absorption Persistence in Immersion