have a clear conscience
Also, have a clean conscience. Feel free of guilt or responsibility. For example, I have a clear conscience—I did all I could to help. This idiom is also put as one's conscience is clear or clean, as in His conscience is clean about telling the whole story. The adjective clear has been used in the sense of “innocent” since about 1400; clean was so used from about 1300.
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Example sentences from the Web for have a clear conscience
The story of fluoridation reads like a postmodern fable, and the moral is clear: a scientific discovery might seem like a boon.
But the tide was turning on this issue, an email from another constituent made clear.
The use of slurs from both characters makes it clear just how “new” the idea of an openly gay son is even in this time.‘Empire’ Review: Hip-Hop Musical Chairs with an Insane Soap Opera Twist|Judnick Mayard|January 8, 2015|DAILY BEAST
ROME — What does it take for a Hollywood A-lister to get a private audience with Pope Francis?Pope Francis Has the Pleasure of Meeting Angelina Jolie for a Few Seconds|Barbie Latza Nadeau|January 8, 2015|DAILY BEAST
Instead, straighten your civic backbone and push back in clear conscience.Why We Stand With Charlie Hebdo—And You Should Too|John Avlon|January 8, 2015|DAILY BEAST
It separates into three layers upon standing—a brown deposit, a clear fluid, and a frothy layer.A Manual of Clinical Diagnosis|James Campbell Todd
Now-a-days it is the bankrupt who flouts, and his too confiding creditors who are jeered and laughed at.Glances at Europe|Horace Greeley
However this be, it is hard to say that these fibs have that clear intention to deceive which constitutes a complete lie.Children's Ways|James Sully
He felt himself the meanest, vilest thing a-crawl upon this sinful earth, and she—dear God!St. Martin's Summer|Rafael Sabatini
All that scientific bric-a-brac in the cupboard had far better be thrown away.The Salvaging Of Civilisation|H. G. (Herbert George) Wells