Blavatsky
Original sense
The Higher Self is not a spirit-guide. It is the reincarnating Ego — Manas illuminated by Buddhi — of which the personality is a short, mostly amnesiac mask. Prayer, for her, is the lower man attempting to hear that Ego, not a conversation with an outside angel.
The ‘Higher Self’ is Atma-Buddhi-Manas, the immortal reincarnating Ego; the ‘lower self’ is the personal, mortal man.
She hammered the distinction: individuality (the thread-soul across lives) versus personality (this name, this body, this memory). ‘Connecting with your higher self’ in her terms is a moral and noetic alignment, not a guided visualization.