To honour a father and mother is to admit that no one invents himself. Someone fed the child before the child could feed himself, and someone spoke before the child could speak. A man who refuses that debt cuts the root he grew from, and a severed root cannot be prolonged into any future.
The promise attached here is not sentimental. A people who despise where they came from cannot hold the land they stand on, because contempt for the past is contempt for the order that made the present possible. Gratitude to those who raised you is the first honest map of the world. Honour what carried you, and you become strong enough to carry what comes next.