She beats upon her bolted door,
With faint weak hands;
Drearily walks the narrow floor;
Sullenly sits, blank walls before;
Despairing stands.

Life calls her, Duty, Pleasure, Gain–
Her dreams respond;
But the blank daylights wax and wane,
Dull peace, sharp agony, slow pain–
No hope beyond.

Till she comes a thought! She lifts her head,
The world grows wide!
A voice–as if clear words were said–
'Your door, O long imprisonéd,
Is locked inside!'

Charlotte Perkins Stetson Gilman

http://www.poemhunter.com/poem/locked-inside-7/