'Etz Chaim' - Tree of Life (Judaism term)
In the Book of Proverbs, the tree of life is associated with wisdom: "[Wisdom] is a tree of life to them that lay hold upon her, and happy is every one that holdest her fast." (Proverbs 3:13-18)
In 15:4 the tree of life is associated with calmness: "A soothing tongue is a tree of life; but perverseness therein is a wound to the spirit."
The kabbalah symbol of Tree of Life represents different qualities and virtues like wisdom, strength, protection, beauty, bounty and redemption. It is also considered to be the symbol of 'Creator'. This tree is associated with the creator because it provides protection, supports abundant fruit production and thereby, regeneration. This analogy can also be used to describe the life of humans. We as humans develop 'roots' of our beliefs, 'branch out' by means of wisdom and the 'trunk' (mind & body) keeps them connected.