As for the individual who has serenity but not discernment: they should approach someone who has discernment and ask: ‘Reverend, how should conditions be seen? How should they be comprehended? How should they be discerned?’ They would answer from their own experience: ‘This is how conditions should be seen, comprehended, and discerned.’ After some time they have both serenity and discernment.
As for the individual who has discernment but not serenity: they should approach someone who has serenity and ask: ‘Reverend, how should the mind be stilled? How should it be settled? How should it be unified? How should it be immersed in samādhi?’ They would answer from their own experience: ‘Reverend, this is how the mind should be stilled, settled, unified, and immersed in samādhi.’ After some time they have both discernment and serenity.