Yes, I do now.
An "eye for an eye" is like the other common phrase, "What goes around comes around."
I did not believe in it for a while until people kept messing with me and I saw where turning the other cheek got me. Not fighting back hurt me more than helped me. So now I do most certainly believe in it, if I am not bothering anybody then they shouldn’t be bothering me. If you plan on causing harm to me or plan on stabbing me in the back, you better prepare for it to be done to you.