莎士比亚十四行诗第一百一十六首。诗人为真爱立下誓言：爱是恒久不移的灯塔，不为变迁所动，不随岁月消磨。纵使红颜老去，此心不改，直至末日。全诗庄重如誓词，是英诗中写爱情坚贞的巅峰。
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 wand’ring 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.