"Who will believe my verse in time to come..."

Who will believe my verse in time to come,
If it were fill'd with your most high deserts?
Though yet
heaven knows it is but as a tomb
Which hides your life, and shows not half your parts.
If I could
write the beauty of your eyes,
And in
fresh numbers number all your graces,
The age to come would say 'This
poet lies;
Such
heavenly touches ne'er touch'd earthly faces.'
So should my papers,
yellow'd with their age,
Be scorn'd, like old
men of less truth than tongue,
And your true rights be term'd a poet's rage
And stretched metre of an antique song:
But were some
child of yours alive that time,
You should live
twice, in it, and in my rhyme.