The cliche activity at a wedding: "Give Advice to the Newly Weds!" The cliche advice: "Never go to bed mad". That doesn't work for us. I can be humble enough to admit I become a mean angry person and that doesn't help anything.
When I write about relationships in fiction I try and highlight the good and bad qualities of ones I've seen before, including my own. So much so that now I'm very conscious about how mine is perceived.
So when I say this is "when I knew", it's not when I knew I wanted to marry him. But knew as a couple we were at a mature and steady point in our relationship to handle getting matching 'wedding band' tattoos.