A realization arising out of a classroom discussion over the topic of marriage:
If two people are in love, then they will remain committed to each other regardless of whether they are married or not. Which means that marriage exists to ensure that two people stay committed to each other even after they fall out of love with each other.
So, marriage is like an insurance policy that operates in the background while we are lovey-dovey as a couple, but kicks in once we can't stand each other any more.
Marriage is certainly not a decision to be taken lightly, if so.