The sentence "Action is Laozi, knowledge is the son, and creation is the grandson" means: Action is the basis for achieving goals, knowledge is the experience accumulated in action, and creation is a higher level leap based on knowledge and action.

First of all, action is the basis for achieving the goal. Only through practical actions can we accumulate experience and discover laws, thus laying the foundation for the accumulation of knowledge.

Secondly, knowledge is accumulated experience in action. To turn experience into knowledge, we need to think and summarize our actions. This process requires us to screen, analyze and summarize the obtained information, thus forming our own knowledge system.

Finally, creation is a higher level leap based on cognition and action. Creation requires us to have enough knowledge as the foundation, and we also need to have the spirit of daring to try and innovate. Only through creation can we achieve higher goals and reach a higher realm.

So this sentence emphasizes the importance of practice, knowledge and innovation, and the relationship between them. Only by accumulating experience and acquiring knowledge in action can we create at a higher level.