How not to have a divorce, what is the secret of avoidance?

Being on route to be married the thought came to me while reading a magazine article, how to or what to do for one have to do to have a solid marriage and avoid divorce? I believe I know but it is untested until I actually am using it. There are things like respect, keeping honest lines of communication open and such. When I was way younger I knew many couples who have been together 15 years, 23, 30, and some who married really early 50 years. Many I know today have 2 marriages in 12 years, 3 in 25 years, very few who have had a marriage longer than 17. What do you believe the secret is to have an enduring marriage? When I put a ring on it I am not taking it off I am in it for the good and the bad, the sickness and health and the richer or poorer.