And if the people seem trustworthy, express your wish for blessings to rest upon them. But if they prove to be untrustworthy, may those blessings remain on you [instead].
And whoever does not welcome you or listen to what you have to say, shake the dust off of your shoes as you leave that house or town. [Note: This was a Jewish custom showing disdain and intended to suggest unworthiness]
And if a son of peace is there [i.e., a peace-loving person], your [request for] peace will rest upon him. But if he is not [a peace-loving person], your [blessing of] peace will return to [rest on] you.
To lost people [we become] a smell of death [i.e., we bring condemnation to people who reject our message]; to saved people [we become] a fragrance of life [i.e., we bring salvation to people who accept our message]. And who is adequate to [accomplish] such tasks?