2.  On the Kabalistic Tree of Life, three is the number of Chesed, the central sephirah on the right-hand pillar, the fourth in order from the top of the Tree. It is important because to travel on the Tree above this Sephirah means that you must cross the Veil of the Abyss. Doing so requires taking the oath that you will consider everything a communication between yourself and the Divine. This can totally uproot your nature on the Earth and result in vast changes in your life.