The higher self is a part of ourself which is beyond and transcends the individual ego, beyond the self serving and selfish aspect of the self. It is understanding and appreciating the sacred and avoids religious dogma and traditions. Altered states of consciousness can be experienced. Spiritual development and values such as serenity, self understanding, joy and gratitude are part of the bigger spiritual picture.
For more information about transpersonal psychology, visit: http://www.meaning.ca/archives/archive/pdfs/davis-transpersonalpsychology.pdf