This "four-sided or balanced state of mind" can be understood metaphysically as an evolutionary prerequisite to the development of Christ Consciousness. It would indicate a consciousness in which all four functions (sensation, intuition, thinking and feeling) are at least somewhat developed and functioning. Numbers are often used as important symbols in the Bible. The number forty is one of these. Four is the symbol of balance and sufficiency. Zero always symbolizes "unlimited or unspecified." So the symbol forty would stand for "a sufficient, but unspecified" period of time or state of consciousness. Ed Rabel, Metaphysics 1, Consciousness, Balanced (Four-Sided) Consciousness"