[586] Sāvatthī. There … "Bhikkhus, there are these four meditators. Which four? Here, bhikkhus, a certain meditator is skilled in concentration regarding concentration (samādhi), but is not skilled in maintenance regarding concentration. Here again, bhikkhus, a certain meditator is skilled in maintenance regarding concentration, but is not skilled in concentration regarding concentration. Here again, bhikkhus, a certain meditator is neither skilled in concentration regarding concentration, nor skilled in maintenance regarding concentration. Here again, bhikkhus, a certain meditator is both skilled in concentration regarding concentration and skilled in maintenance regarding concentration. Therein, bhikkhus, the meditator who is both skilled in concentration regarding concentration and skilled in maintenance regarding concentration is the foremost, the best, the preeminent, the highest, and the most excellent of these four meditators. Just as, bhikkhus, from a cow comes milk, from milk comes curd, from curd comes butter, from butter comes ghee, and from ghee comes the cream of ghee, which is declared the foremost of them — even so, bhikkhus, the meditator who is both skilled in concentration regarding concentration and skilled in maintenance regarding concentration is the foremost, the best, the preeminent, the highest, and the most excellent of these four meditators."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.