Well... the Bible, definitely... on a continuous basis.
Otherwise...
This might sound kind of strange, but I'm thinking of Lynn Kurland's romance novels. This wasn't an earth-shattering change, but a gentle slight one that I believe God used to show me other things.
Her heros are fantastic heros, not because she's given them fantastic abilities (they're only slightly better-than-average in the world they live in). They're fantastic because she portrays them to show how wonderful the love of a sometimes-grumpy, often-stubborn, very normal MAN... can be. AND she portrays quite well, in some of them, how much the strongest of men still need a woman to stand by them.
They changed my life in how I look at my husband and my own marriage. Now I am better able to see the romance and the love that's under my own husband's prickly exterior. Now I can see more easily how my husband's over-protectiveness is nothing more than the modern version of the protective instinct, prompted by a desperate love, that the knights of old felt when they'd do anything to protect their women. I love it in the books... why didn't I love it in modern life? Just because I don't perceive modern life as being as dangerous, doesn't change the fact that MY man is protective because he's not sure how he'd go on living without me.
It was just little tiny things like that, that helped me look at my husband in a new way, and that's really enhanced my marriage and made me appreciate the manly things that used to drive me nuts. :-)