In Alice Bailey’s books, there are several mentions of the word “sphere” or “spheres” in various contexts. She uses the term “spheres” to refer to different levels of consciousness or planes of existence, which are considered important in her teachings of Theosophy.

For example, in her book “The Externalisation of the Hierarchy”, she mentions spheres of activity and consciousness, in which the spiritual Hierarchy of Masters operates, in order to influence human evolution. She also refers to the concept of ‘spheres of influence’ which refers to the areas of activity and focus of the spiritual Hierarchy.

In her book “Initiation, Human and Solar” she mentions the concept of the “transcendent sphere” which is the spiritual realm where the initiated person can access the higher states of consciousness. She also refers to the “spheres of soul activity” which are the different levels of consciousness that the soul can access.

In her book “Treatise on Cosmic Fire” she refers to the “spheres of cosmic activity” which are different planes of existence that are related to the different aspects of the universe.

It’s worth noting that the concepts of spheres and levels of consciousness are central to Theosophical teachings and are often discussed in Theosophical literature.