Sonnet 116-

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 it 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.
                                                    Wm. Shakespeare