Ought not (ου χρη). The only use of this old impersonal verb (from χραω) in the N.T. It is more like πρεπε (it is appropriate) than δε (it is necessary). It is a moral incongruity for blessing and cursing to come out of the same mouth.

So to be (ουτως γινεσθα). "So to keep on happening," not just "to be," present middle infinitive of γινομα.