"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."

---Sonnet 116, William Shakespeare