1593-1603 by Shakespeare 
Sonnet 116 

1	Let me not to the marriage of true minds
2	Admit impediments. Love is not love
3	Which alters when it alteration finds,
4	Or bends with the remover to remove.
5	O no, it is an ever fixèd mark
6	That looks on tempests and is never shaken#
7	It is the star to every wand’ring barque,
8	Whose worth’s unknown although his height be taken.
9	Love’s not time’s fool, though rosy lips and cheeks
10	Within his bending sickle’s compass come#
11	Love alters not with his brief hours and weeks,
12	But bears it out even to the edge of doom.
13	If this be error and upon me proved,
14	I never writ, nor no man ever loved.