conscience (n.) 2
real knowledge, internal conviction, true understanding
3H6 I.i.150 [Exeter to York, of the King] My conscience tells me he is lawful king
Oth IV.iii.58 [Desdemona to Emilia] Dost thou in conscience think ... / That there be women do abuse their husbands / In such gross kind?
Tim II.ii.180 [Timon to Flavius] Canst thou the conscience lack / To think I shall lack friends?