From the book "Dossier on the Ascension":
The Holy Christ Self is the presence of the Universal Christ that is individualized for each one of us. “The Christ” is actually a title given to those who have attained Oneness with their Higher Self or Christ Self. That's why Jesus was called “Jesus, the Christ”. Christ comes from the Greek word Christos meaning “anointed” - anointed with the Light of God.
Each of us has a Higher Self, or “inner Christ”, and each of us is destined to become one with that Higher Self - whether we call it the Christ, the Buddha, the Tao, or the Atman. This “inner Christ” is what the Christian mystics sometimes refer to as the “inner man of the heart”, and what the Upanishads mysteriously describe as a being the “size of a thumb”, who dwells deep within the heart.
We all have moments when we feel that connection with our Higher Self - when we are creative, loving, joyful. But there are other moments when we feel out of sync with our Higher Self - moments when we become angry, depressed, and lost. What the Spiritual path is all about is learning to sustain the connection to the Higher part of ourselves so that we can make our greatest contribution to Humanity.