If my marriage were defined by your marriage:

Then, I'd worry about whether you were well suited to each other. 

Do you fight a lot? 

Is one of you more attractive than the other? 

Does one of you have a much larger earning potential than the other? 

Will one of you be a much more nurturing parent than the other? 

Is it your first marriage, or your second, third or fourth? How likely is this marriage to succeed? 

How long did you know each other before you decided to marry? 

Do your parents approve? 

How committed are you to making your marriage succeed? 

But, you see, the sanctity of MY MARRIAGE does not depend upon the details of YOUR MARRIAGE. 

Whether you stay married for 78 years, or divorce in a few months, my marriage does not depend upon yours. 

Whether you are black, or white, or purple with pink polka dots, my marriage does not depend upon yours. 

Whether you are republican, or democrat, or libertarian, or green, American Independent et al, 

MY MARRIAGE DOES NOT DEPEND UPON YOURS. It's mine. 

Whether you love a person of the opposite gender, or of your same gender, it does not affect my marriage. 

My Marriage is strong. It is built on LOVE. No matter who ANYONE ELSE MARRIES, it does not make my marriage less than it was before. 

(posted originally on a message board I frequent - in response to California's Supreme Court upholding Prop. 8 - my feelings exactly.)