William Shakespeare, Sonnet xxxviii
How can my muse want subject to invent, 
While thou dost breathe, that pour'st  into my verse 
Thine own sweet argument, too excellent 
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For every vulgar paper to rehearse? 
O, give thyself the thanks, if aught in me 
Worthy perusal stand against thy sight; 
For who's so dumb that cannot write to thee, 
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When thou thyself dost give invention light? 
Be thou the tenth muse, ten times more in worth 
Than those old nine which rhymers invocate; 
And he that calls on thee, let him bring forth 
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Eternal numbers to outlive long date. 
If my slight muse do please these curious days, 
The pain be mine, but thine shall be the praise.