All 3 Uses

conscience
in
Othello, the Moor of Venice
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Though in the trade of war I have slain men, Yet do I hold it very stuff o' the conscience To do no contriv'd murder: I lack iniquity Sometimes to do me service: nine or ten times I had thought to have yerk'd him here under the ribs.†
Scene 1.2

conscience = feeling or appraisal of having personally behaved in a morally right or wrong manner
I know our country disposition well; In Venice they do let heaven see the pranks They dare not show their husbands; their best conscience Is not to leave undone, but keep unknown.†
Scene 3.3
—Dost thou in conscience think,—tell me, Emilia,—That there be women do abuse their husbands In such gross kind?†
Scene 4.3 *

Definitions:

(1) (conscience)
feeling or judgment of morally right or wrong personal behavior
(2) (meaning too rare to warrant focus)