It is a happiness to wonder; -- it is a happiness to dream.

I was cautious in what I said before the young lady; for I could not be sure that she was sane; and, in fact, there was a certain restless brilliancy about her eyes that half led me to imagine she was not.

From the dim regions beyond the mountains at the upper end of our encircled domain, there crept out a narrow and deep river, brighter than all save the eyes of Eleonora; and, winding stealthily about in mazy courses, it passed away, at length, through a shadowy gorge, among hills still dimmer than those whence it had issued. We called it the "River of Silence"; for there seemed to be a hushing influence in its flow. No murmur arose from its bed, and so gently it wandered along, that the pearly pebbles upon which we loved to gaze, far down within its bosom, stirred not at all, but lay in a motionless content, each in its own old station, shining on gloriously forever.

...the traveler, travelling through it,
May not-dare not openly view it;
Never its mysteries are exposed
To the weak human eye unclosed;
So wills its King, who hath forbid
The uplifting of the fringed lid;
And thus the sad Soul that here passes
Beholds it but through darkened glasses.

A short story must have a single mood and every sentence must build towards it.

All that we see or seem is but a dream within a dream.