Without trouble and pain you cannot open it quite, but you CAN open it.

At worst you could beat it open! I pray you, gather your strength, and open it wide." "I will not try what I know impossible.

It would be the part of a fool!" "Which you have been playing all your life! Oh, you are hard to teach!" Defiance reappeared on the face of the princess.

She turned her back on Mara, saying, "I know what you have been tormenting me for! You have not succeeded, nor shall you succeed! You shall yet find me stronger than you think! I will yet be mistress of myself! I am still what I have always known myself--queen of Hell, and mistress of the worlds!" Then came the most fearful thing of all.

I did not know what it was; I knew myself unable to imagine it; I knew only that if it came near me I should die of terror! I now know that it was LIFE IN DEATH--life dead, yet existent; and I knew that Lilith had had glimpses, but only glimpses of it before: it had never been with her until now.
She stood as she had turned.