airless

I know where I will wear this dagger then ;
Cassius from bondage will deliver Cassius .
Therein , you gods , you make the weak most strong ;
Therein , you gods , you tyrants do defeat .
Nor stony tower , nor walls of beaten brass ,
Nor airless dungeon , nor strong links of iron ,
Can be retentive to the strength of spirit ;
But life , being weary of these worldly bars ,
Never lacks power to dismiss itself .
If I know this , know all the world besides ,
That part of tyranny that I do bear
I can shake off at pleasure .