who is silvia?

Who is Silvia?

Language: ENGLISH

 Who is Silvia? what is she,
 That all our swains commend her?
 Holy, fair and wise is she;
 The heavens such grace did lend her,
 That she might admiréd be.

 Is she kind as she is fair?
 For beauty lives with kindness.
Love doth to her eyes repair,
 To help him of his blindness,
 And being helped, inhabits there.

 Then to Silvia let us sing,
 That Silvia is excelling;
 She excels each mortal thing
 Upon the dull earth dwelling;
 To her let us garlands bring.

William Shakespeare. 

I have trouble understanding the bold text. 

Thank you