We are taught that on our wedding day we are forgiven for all our sins.
My hidush is this: Every day that we restore our relationship to the status it had on our wedding day, we are forgiven for our sins.
People may say (and rightly so) no, your relationship has grown since your wedding, bringing it back to the relationship it was on the day of your wedding would be a step backwards. True. But the intention here is not that your relationship is the same as on your wedding day, but rather just as on your wedding day you were in a state of complete peace with one another, any day you restore total and complete shalom bayit, that day is like your wedding day.
To those who feel this isn't very difficult, I'm happy to hear that. I don't even know if it is difficult at all. My point is that the kavanah of the statement that we are foregiven for our sins on our wedding day is based in the shalom and unity of the new couple. Whenever we act to maintain that unity, HaShem certainly forgives us our past sins.
[this is why, in shacharit, creating shalom bayit is one of the things that "we eat the fruits in this world, and the keren, the lump sum, is waiting for us in the next world," we merit to be foregiven in this world, that is the fruit we eat, and in turn, because we are absolved in this world, we receive the next world as well.]