Definition of "edifying"

Do not let any corrupt communication proceed out of your mouth, but that which is good for the use of edifying that it may minister grace unto the hearers.

1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], Ephesians 4:29

I am slightly skeptical about the neatness of these edifyings in the play. Olivia remains my best positive case, Malvolio my best negative. "Too proud," as Viola says, Olivia is humbled by both Feste and Viola, her twin fools, but more obviously and more frequently by herself, until finally she is blessed with the joy of undeserved grace and love. Malvolio will not learn that his madness is everyone's madness in Illyria.

2002, E. Beatrice Batson, Selected comedies and late romances of Shakespeare from a Christian perspective