Not from the Bible

But useful: 10 Ways to Reduce Your Divorce Risk.

The 2-year courtship thing seems like a bit much to me, and this list omits advice I would deem indispensable like "do hard things together" (she says just "do things together", which I think is less than the minimum), and "plan your family's future".

However, for someone who's not marriage at all, this list is a good place to start thinking about what it means to be married and not just in a relationship.