with a safe conscience

adverb

Roget 946: innocently etc. adj.; with clean hands; with a clear conscience, with a safe conscience.   

Roget 926: with a safe conscience, as in duty, bound, on one's own responsibility, at one's own risk, suo periculo [Lat.]; in foro conscientiae [Lat.]; quamdiu se bene gesserit [Lat.].   

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