What are the importance of maturity before marriage?

When we talk about "maturity" there are different ways in which people can be mature and different ways in which they can be immature.

It is possible for a physical giant to be an emotional dwarf. It is possible for a grown man to be as immature as a 14-year-old boy. It is possible for a beautiful woman to be an emotional child.

The connection this has with marriage: Marriage requires maturity and immaturity in marriage is the reason many marriages fail!