"As soon as I grasp the World Deity Heart, it will naturally embody the grade two Space Deity Heart." Xue Ying smiled as he said, "Once that happens, so long as I develop it with the Space Deity Heart as the foundation, there’s a chance that it’ll develop into the Space Time Deity Heart."
The heavens and earth were both originally one body. All true meanings were inherently related, and there were many overlapping aspects between them.
The True Meaning of the World inherently contained the complete True Meaning of Space, Mirage, and many other similar True Meanings. Once one achieved the Deity Heart level, it would also naturally contain many different grade two Deity Hearts. In fact, the True Meaning of the World even contained a portion of the True Meaning of Star!
As for the Space-Time Deity Heart, it was as it sounded: a combination of space and time.
Both the True Meanings of the World and of Space Time contained Space within them!