undiscovered country

Who would fardels [burdens] bear,
To grunt and sweat under a weary life,
But that the dread of something after death,
The undiscover’d country from whose bourn [shores]
No traveller returns, puzzles the will,
And makes us rather bear those ills we have
Than fly to others that we know not of?
Thus conscience does make cowards of us all.

   −William Shakespeare (Hamlet III, 1)