It is in the very nature of conjugal love to be definitive. The lasting union expressed by the marriage vows is more than a formality or a traditional formula; it is rooted in the natural inclinations of the human person.
When any two young people take it into their heads to marry, they are pretty sure by perseverance to carry their point, be they ever so poor, or ever so imprudent, or ever so little likely to be necessary to each other's ultimate comfort.
Happiness in marriage is entirely a matter of chance. If the dispositions of the parties are ever so well known to each other or ever so similar beforehand, it does not advance their felicity in the least. They always continue to grow sufficiently unlike afterwards to have their share of vexation.