What is an evolved spirit?

All Life is Spirit. The refrain of all Nature is—

All life is spirit.

And all spirit is in course of evolution through innumerable forms and changes and lives until it reaches and passes through the human form and continues its evolution in the spiritual world.

The spirit is transferred to the spiritual world, as soon as it has evolved sufficient vitality, strength and development to no longer need the protection of a physical material form. 

And this requires at least one hundred thousand centuries of our earth time. 

The spirit that has attained to the spiritual world has covered less than one-half its journey to the higher heavens of the first spiritual world where the angels dwell and where all spirits who attain to that zone become angels.

The angels of the higher heavens of the first spiritual world are still at the beginning of their journey. They have just begun to enter into the joys of life. All eternity is before them—and an innumerable number of other spiritual worlds through which to evolve and to enjoy life.

Fragments of Spiritual Knowledge Pertaining to the Spiritual World