| Ham III.iv.37 | [Hamlet to Gertrude, of wringing her heart] For so I shall, / If it be made of penetrable stuff |
| Luc.559 | [of Tarquin listening to Lucrece] his heart granteth / No penetrable entrance to her plaining |
| R3 III.vii.224 | [Richard to all] I am not made of stone, / But penetrable to your kind entreaties |