Marriage is the most critical and demanding partnership i have ever seen.
You have to give your all into it to get a remarkable results out of it. Giving into marriage includes your time,being a great forgiver,closing every communication gaps,having listening ears,commitment,self sacrifice,the to do lists is endless.
Marriage is sacred and you need much of God to make it happen.
The first institution God created was Marriage,we can see the obvious that the creator usually has the manual of eqiupment they make and since God is the ceator of marriage,the holy book (bible) is the creator's manual for marriage,He said in Joshua 1vs 8,the book of the law will not depart from your mouth,you shall medidate day in,day out.
However,knowing what to say and when to say those things really matter in this great institution of ours. Pick your words as careful as possible,no matter what's happening.
I wish you all the best in our relationships. 
having God as the center of your marriage is a must, once God is in the center everything will be easier. :)
You are right but few people realise this...