And, with a virtuous vizor, hide deep vice.
Richard III., ii. 2.
Oh! what authority and show of truth
Can cunning sin cover itself withal.
Much Ado About Nothing, iv. 1.
There is no vice so simple but assumes
Some mark of virtue on his outward parts.
Merchant of Venice, iii. 2.
Seems he a dove? his feathers are but borrowed;
Is he a lamb? his skin is surely lent him,