Don Juan (Canto 4) Lord Byron

Nothing so difficult as a beginning
In poesy, unless perhaps the end;
For oftentimes when Pegasus seems winning
The race, he sprains a wing, and down we tend,
Like Lucifer when hurl'd from heaven for sinning;
Our sin the same, and hard as his to mend,
Being pride, which leads the mind to soar too far,
Till our own weakness shows us what we are.

But Time, which brings all beings to their level,
And sharp Adversity, will teach at last
Man,—and, as we would hope,—perhaps the devil,
That neither of their intellects are vast:
While youth's hot wishes in our red veins revel,
We know not this—the blood flows on too fast;
But as the torrent widens towards the ocean,
We ponder deeply on each past emotion.

As boy, I thought myself a clever fellow,
And wish'd that others held the same opinion;
They took it up when my days grew more mellow,
And other minds acknowledged my dominion:
Now my sere fancy 'falls into the yellow
Leaf,' and Imagination droops her pinion,
And the sad truth which hovers o'er my desk
Turns what was once romantic to burlesque.