What is the Fourth Dimension?

This: 

...it is a plane of a type of bipedal vehicle which is much denser and more full of life; it is a plane wherein one is aware of the thoughts of other-selves; it is a plane where one is aware of the vibrations of other-selves; it is a plane of compassion and understanding of the sorrows of third density; it is a plane striving towards wisdom or light; it is a plane wherein individual differences are pronounced although automatically harmonized by group consensus.

Live there.