The Key to the Master's teaching is to be found in his discourse with the Woman of Samaria, and it is contained in the statement that "the Father" is Spirit, that is, Spirit in the absolute and unqualified sense of the word, as appears from the original Greek, and not "A Spirit" as it is rendered in the Authorised Version: and then as the natural correlative to "the Father" we find another term employed, "the Son." The relation between these two forms the great subject of Jesus' teaching, and, therefore, it is most important to have some definite idea of what he meant by these terms if we would understand what it was that he really taught. Now if "the Father" be Spirit, "the Son" must be Spirit also; for a son must necessarily be of the same nature as his father. But since "the Father" is Spirit, Absolute and Universal, it is evident that "the Son" cannot be Spirit, Absolute and Universal, because there cannot be two Universal Spirits, for then neither would be universal. We may, therefore, logically infer that because "the Father" is Universal Spirit, "the Son" is Spirit not universal; and the only definition of Spirit not-universal is Spirit individualised and particular. The Scripture tells us that "the Spirit is Life," and taking this as the definition of "Spirit," we find that "the Father" is Absolute, Originating, Undifferentiated Life, and "the Son" is the same Life differentiated into particular forms. Hence, in the widest sense of the expression, "the Son" stands for the whole creation, visible or invisible, and in this sense it is the mere differentiation of the universal Life into a multiplicity of particular modes. But if we have any adequate idea of the intelligent and responsive nature of Spirit[2]--if we realise that because it is Pure Being it must be Infinite Intelligence and Infinite Responsiveness--then we shall see that its reproduction in the particular admits of innumerable degrees, from mere expression as outward form up to the very fullest expression of the infinite intelligence and responsiveness that Spirit is. [Footnote 2: _Intelligence_ and _Responsiveness_ is the Generic Nature of Spirit in _every_ Mode, and it is the _concentration_ of this into centres of consciousness that makes personality, i. e., _self_-conscious individuality. This varies immensely in degree, from its first adumbration in the animal to its intense development in the Great Masters of Spiritual Science. Therefore it is called "The Power that Knows Itself"--It is the power of _Self_-recognition that makes _personality_, and as we grow to see that our personality is not all contained between our hat and our boots, as Walt Whitman says, but _expands_ away into the Infinite, which we then find to be _the Infinite of ourselves_, the _same_ I AM that I am, so _our personality_ expands and we become conscious of ever-increasing degrees of Life-in-ourselves.]