C1173 The Difference Between Heaven and Earth
Even though there was only a difference of one level between a Worldly Immortal and a Heavenly Immortal, the difference was like heaven and earth.
Worldly Immortals and Heavenly Immortals were definitely the difference between a child and an adult.
Once one became a Celestial Immortal, one would be able to travel far away and completely leave the protection of one's parents