Shakespeare's Love 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 bears it out even to the edge of doom.
　　
　　If this be error and upon me proved,
　　I never writ, nor no man ever love
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　　If this be error and upon me proved,
　　I never writ, nor no man ever love