“Her soul returned often but the conscience was habitually absent. And together; dangerous.”
1981
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The Mistress: A Song, ll. 5–8.
Other

“Sir, more than kisses, letters mingle souls;
For, thus friends absent speak.”
Verse Letter to Sir Henry Woton, written before April 1598, line 1
Variant: More than kisses, letters mingle souls.

“The torture of a bad conscience is the hell of a living soul.”
“Confession is good for the conscience, but it usually bypasses the soul.”
The Complete Neurotic's Notebook (1981), Unclassified

“The eyes are the reflection of the conscience of any living soul.”
Original: Gli occhi sono il riflesso della coscienza di ogni animo vivente.
Source: prevale.net

“Susan had an earnest soul, a conscience tending to morbidity.”
Susan B. Anthony (1884)