" The cultivation of serenity requires skill in steadying, composing, unifying, and concentrating the mind. The cultivation of insight requires skill in observing, investigating, and discerning conditioned phenomena, spoken of as “formations” (saṅkhārā). In line with the preceding text, this sutta confirms that some meditators begin by developing internal serenity of mind, others by developing the higher wisdom of insight into phenomena, others by developing both in tandem. "

― , In the Buddha's Words: An Anthology of Discourses from the Pali Canon