Being one with the human was a realm. In theory, anyone who had reached the transcendence realm could reach the realm of being one with the human, but only one in ten thousand people could really reach it.
It was extremely difficult to achieve the state of 'one with the world'. First of all, your Dharma power must reach a high level of metal, and your whole body must be able to move. Furthermore, your Dharma power must be extremely solid and suitable for you.
This wasn't a simple matter. Many people didn't know whether the Dharma was suitable for them when they condensed it. By the time they condensed it, they would realize that it wasn't very suitable for them. However, it was already too late.
Of course, most people would never realize that the Dharma they condensed was not suitable for themselves. Only a true master would realize this problem.
