Life spirit

The life spirit (skrt. Buddhi; Greek Χριστός Chrestós) is the second of the three spiritual members of the human being. In the Jewish Kabbalah, the life spirit is called Chaja (Hebrew חיה) and is centred on the Tree of Life of the Kabbalah in the second Sephira Chochmah (wisdom). According to Rudolf Steiner, the Hebrew term Kohelet (Hebr. קהלת, preacher, gatherer, community leader) also stands for this. The term buddhi is first mentioned in the Katha Upanishad:

A charioteer is, know,
The Atman, chariot is the body,
Steering the chariot is Buddhi
Manas, know, is the reins.

Katha Upanishad: 3.3