Impressive Clergyman: Mawwage. Mawwage is what bwings us togethew today. Mawwage, that bwessed awwangement, that dweam within a dweam.
Now, that I've added some brevity, let's get to the meat. First, so you have my perspective, my parents divorced when I was young. I think this is something to be avoided at all costs. I will be married exactly once. (And I am married now). I think there are 4 things you must agree on for a marriage to succeed.
If you do not agree on all 4 of these, I don't think that the marriage can survive. I could be wrong, and will be happy when I am, but I think this increases your chances.
Note, that this does NOT mean you should say, well, we don't agree but he/she will change her mind in a few years. That's playing Russian Roulette. Go to Vegas instead and gamble, don't do it with marriage.
There are two kinds of people in the world, Spenders and Savers. They can not live in harmony. The Saver will resent the Spender not being fiscally responsible, and the Spender will resent the Saver being a tightwad.
This doesn't mean you have to both be at the extremes, but you at least have to be orbiting the same planet.
You had both better want them or not want them, or one of you had better not have strong feelings on it. If you both agree that you will not have children, make sure no one's biological clock is ticking. Also, make sure that you agree on the same ballpark number of children. If one of you is thinking about a tennis doubles team, and the other about a football team, that could be a problem.
...or sex. No one wants to talk about it, but you had better both agree on it. If you don't believe in premarital sex, well that's great. But a good portion of your waking hours had better be thinking about how nice it would be to do the 'Magic Salami Dance of Pleasure'. For that matter, a few of your sleeping hours as well.
If you do believe in premarital sex, and 'Premarital Sex Fairy' has brought you presents, you had better make sure you like them, and you will continue to like them. Don't get married thinking that for some reason some deficit in your love life will change.
If you fill out the census form 'Roman Catholic' and your spouse to be fills it out 'No', this could be an issue. Do you want your children to go to a Sunday school? A religiously oriented preschool? Do you live in Israel and your spouse in Egypt? Are you Hindu and you think when your spouse is 'Sihk' it means they have an incurable disease?
These are problems. Have them worked out. Make sure this won't cause relatives to die of apoplexia. (Or at least the ones you like.)
You need to have one of each. If you have two cold people, they will get together and freeze to death in bed. That is actually the reason they always find frozen cavemen, but not not cavewomen. The other cavemen would remove her from the deadly embrace and use their magical caveman powers to warm her up so she could be paired with a hot caveman.
If you have two hot people, they will spontaneously combust in bed one night. You'll have two piles of ash and a black spot. Be responsible, down't allow spontaneous human combustion to throw your family into emotional turmoil.
Your best hope for marital bliss is to have a dog-like cat (affectionate) and a cat-like dog (maybe a pug?)
A morning person thinks that late night TV is the 6:00 o'clock news, and wonders why anything needs to be open 24 hours a day.
Make sure that you have cable television and a dark bedroom, and you're weighting the die in your favor.