William Shakespeare's "SONNET NO. 116" (Let me not to the marriage of true minds): Analysis of Rhetoric

Let me not to the marriage of true minds
Admit impediments. Love is not love
Which alters when it alteration finds,
Or bends with the remover to remove:
O no! it is an ever-fixed mark
That looks on tempests and is never shaken;
It is the star to every wandering bark,
Whose worth's unknown, although his height be taken.
Love's not Time's fool, though rosy lips and cheeks
Within his bending sickle's compass come:
Love alters not with his brief hours and weeks,
But bears it out even to the edge of doom.
If this be error and upon me proved,
I never writ, nor no man ever loved.

"Let me hot to the marriage of true minds  

This is a case  of  Hyperbaton since the normal word order should have been.

            This is also a case of synecdoche (abstract for the cocrety ) since the abstract ‘ true minds’ stands for the concrete  lovers who are faithful to 'each other ’

     It is also a case of Alliteration  since the sound /m/ occurs at the beginning of words.

    “ oh , no! it is an ever- fixed mark,

  ---This is a case of metaphor . Love has  been compared to the sea mark by which ships know their position are guide their courses . The comparison is not made explicitly.

    “It is the star to every  wandering bark ”

This is a case of Metaphor . Love has been compared to a star , usually the polestar , by which Ships know their position and the direction.
This is also a case of synecdoche (material for the thing made ) . Here the ‘bark’ the matrial with which the ship is made stands for the ship it self .

    " Lover’s not Time’s fool, though rosy lips and cheeks 
within his bending sickle’s compass come ;"

 This is a case of Personification. Time as been spoken of as if it is a king who could employ and make the clown behave as he liked.

It is a case of Metaphor because Time is also been comp0ared to a harvester with a sickle  in his hand.

It is a case of synecdoche  because the Rosy lips and cheeks, the concrete, stands for the abstract , for beauty.

 It may also be considered as  a case of Transferred Epithet , ‘Bending’ stands not only for the shape of the sickle but also for man .