I am convinced the only reason marriage exists is to teach us how to love better.  Each person is sinful (and very imperfect).  And selfish.  Living with another forces us to examine our own foibles.

Some marriages are a better fit than another.  It does not matter.  At some point, there is going to be conflict.  And how successfully you work it out determines the success of your marriage.

Each person is selfish and conflict draws this out.  The vows say for better or worse, in sickness or health.  Commitment is always the key.  Do you ride out the rough moments?  Every marriage will have difficult times.

Your partner sees all your sides given enough time.  The good points of yours as well as your bad side.  Nothing is hidden.

Only love can transcend them.  That is why I say the institution of marriage was created for only one reason–to teach us how to love better.

Your rough points given enough time in a marriage becomes smoothed over.  Love is always the key.  And commitment makes it work.