O Time! who know'st a lenient hand to lay
Softest on sorrow's wound, and slowly thence
(Lulling to sad repose the weary sense)
The faint pang stealest unperceived away;
On thee I rest my only hope at last,
And think, when thou hast dried the bitter tear
That flows in vain o'er all my soul held dear,
I may look back on every sorrow past,
And meet life's peaceful evening with a smile—
As some lone bird, at day's departing hour,
Sings in the sunbeam, of the transient shower
Forgetful, though its wings are wet the while:—
Yet ah! how much must that poor heart endure,
Which hopes from thee, and thee alone, a cure!

William Lisle Bowles

http://www.poemhunter.com/poem/sonnet-july-18th-1787/