Commitment--- dedication and restriction to only one partner.
Marriage is bound by so many restrictions, even if they are not visible enough. 'Freedom' has its limits too.
Your wife should be here when you reach home--- that's one example.
Personally, I would prefer marriage as a union with all its restraints. That's a "bond".
And harder it is, longer it lasts.
Temporary contract?
Divorce is not a play, and marriage, not a game, boy.
It is the only contract that lasts for a lifetime, else, it’s not a contract.