The phrase that is translated in some English versions with “gentle and quiet in spirit” was translated into Kahua with the idiom that verbatim says “be beautiful in your belly.” (Source: Daniel Clark)
In the Tagalog and Indonesian Common Language Translations it is translated as “gentle character” (source: Daniel Arichea in The Bible Translator 1983, p. 209ff. )
See also gentleness and spirit of gentleness.