Everyone dreamt of going to heaven.
Everyone dreamt that one day we would have wings on our back as we soared through the sky and breathed in the crisp, fresh air.
But to be honest...
If we had wings, then we would be birdmen.
Understanding and execution...
Those were two very different concepts.
That was the problem that Fang Zhengzhi was facing. He understood the meaning and gist of the Heavenly Dao, but he could not wield it.
The simplest example of this was, one may understand a dialect, but that didn't mean that one could speak it fluently. It also did not mean that one would be able to replicate the accent.
That is something that requires practice and time.
Mere understanding was insufficient. He needs to cultivate and experience it for himself. That was the only way he could achieve this.
This didn't mean that Fang Zhengzhi's understanding was completely useless.