I found it on Barry Taylor's site.

Believe me, if all those endearing young charms
Which I gaze on so fondly today
Were to change by tomorrow and flee from my arms
Like fairy gifts fading away,
Though would'st still be adored as this moment thou art,
Let thy loveliness fade as it will,
And around the dear ruin each wish of my heart
Would entwine itself verdantly still.

It is not while beauty and youth are thine own
And thy cheeks unprofaned by a tear
That the fervor and faith of a soul can be known
To which time will but make thee more dear.
No, the heart that has truly loved never forgets,
But as truly loves on to the close,
As the sunflower turns on her god when he sets
The same look which she'd turned when he rose.

HTML line breaks added. --JoeClone, 19-Mar-02.