Dutiyavasa sutta: Mastery of the Mind (2nd)

“Mendicants, having seven qualities Sāriputta has mastered his mind and is not mastered by it. What seven? Sāriputta is skilled at immersion, skilled in entering immersion, skilled in remaining in immersion, skilled in emerging from immersion, skilled in positivity for immersion, skilled in the territory of immersion, and skilled in projecting the mind purified by immersion. Having these seven qualities Sāriputta has mastered his mind and is not mastered by it.”