“The more you obey your conscience, the more your conscience will demand of you.”
Book IV, Chapter 8, "Is Christianity Hard or Easy?"
Mere Christianity (1952)
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Clive Staples Lewis 272
Christian apologist, novelist, and Medievalist 1898–1963Related quotes

“What does your conscience say? — "You shall become the person you are."”
Was sagt dein Gewissen?
'Du sollst der werden, der du bist.'
Variant translation: Become who you are.
It is noted here http://www.anonymityone.com/Faq97.htm, here http://www.google.it/search?num=100&hl=en&safe=off&q=%22Become%20who%20you%20are%22+Pindar+Nietzsche&um=1&ie=UTF-8&tbo=u&tbm=bks and here http://www.google.it/search?num=100&hl=it&safe=off&biw=1440&bih=690&q=%22%28become+what+you+are%29+after+the+ancient+Greek+poet+Pindar.+See+Ecce+Homo+%28Nietzsche%29%22 that the phrase was first used by Pindar, and was merely re-used by Nietzsche.
Sec. 270
The Gay Science (1882)

“Calumny can injure you only if you reflect yourself in others and not in your conscience.”
Examples of self-translation (c. 2004), Quotes - Zitate - Citations - Citazioni

“A clean conscience might help you to get into heaven. but it won't help your career.”
The Time of the Hero (1963)