What Is The Correct Thing To Write In A Wedding Card Vows For My Wedding?

Vows for my wedding? - what is the correct thing to write in a wedding card

I would write my own vows. But the problem is that I do not know where to start. I know myself, I feel, and I usually word things very well. But when it comes to that I am not able to put my words in the right direction. "I do not want to appear inconsistent mumbo-jumbo. Who advice?