they say that it takes adversity to bring out the best in a couple. that if a couple stays together... stands by each other through difficult times... then they will stay together no matter what.
i wonder how a couple would know that they've been through enough? it's one thing to say "i know we will be happily together, forever" and it's another to really really understand and mean it.
and once they know... do the tough times stop? or is it like the GRE... if you manage to survive through the tough times... going forward.. they only get tougher?
edited to add:
'forever', for the purview of this post, refers to "till death do us part".