However impenetrable it seems, if you don't try it, then you can never do it.
Andrew Wiles
I have discovered motives, my own and everyone else's, to be impenetrable.
Alex Miller
Bereavement is a darkness impenetrable to the imagination of the unbereaved.
Iris Murdoch
Of all the mysteries of the stock exchange there is none so impenetrable as why there should be a buyer for everyone who seeks to sell.
John Kenneth Galbraith
Have you hit an obstacle that appears impenetrable? Maybe God will guide you to see something that you couldn't have seen if he'd just removed the wall.
Craig Groeschel
If man puts his honor first in relying upon himself, knowing himself and applying himself, this in self-reliance, self-assertion, and freedom, he then strives to rid himself of the ignorance which makes a strange impenetrable object a barrier and a hindrance to his self-knowledge.
Max Stirner
Wiles, Andrew
Wilhelm II of Germany
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