In the world-symbols, found in every religion, the Point--that which has position only--has been taken as a symbol of the First Person in the Trinity. On this symbol St. Clement of Alexandria remarks that we abstract from a body its properties, then depth, then breadth, then length; "the point which remains is a unit, so to speak, having position; from which if we abstract position, there is the conception of unity."[273] He shines out, as it were, from the infinite Darkness, a Point of Light, the centre of a future universe, a Unit, in whom all exists inseparate; the matter which is to form the universe, the field of His work, is marked out by the backward and forward vibration of the Point in every direction, a vast sphere, limited by His Will, His Power. This is the making of "the earth by His Power," spoken of by Jeremiah.[274] Thus the full symbol is a Point within a sphere, represented usually as a Point within a circle. The Second Person is represented by a Line, a diameter of this circle, a single complete vibration of the Point, and this Line is equally in every direction within the sphere; this Line dividing the circle in twain signifies also His duality, that in Him Matter and Spirit--a unity in the First Person--are visibly two, though in union. The Third Person is represented by a Cross formed by two diameters at right angles to each other within the circle, the second line of the Cross separating the upper part of the circle from the lower. This is the Greek Cross.[275] When the Trinity is represented as a Unity, the Triangle is used, either inscribed within a circle, or free. The universe is symbolised by two triangles interlaced, the Trinity of Spirit with the apex of the triangle upward, the Trinity of Matter with the apex of the triangle downward, and if colours are used, the first is white, yellow, golden or flame-coloured, and the second black, or some dark shade. The kosmic process can now be readily followed. The One has become Two, and the Two Three, and the Trinity is revealed. The Matter of the universe is marked out and awaits the action of Spirit. This is the "in the beginning" of Genesis, when "God created the heaven and the earth,"[276] a statement further elucidated by the repeated phrases that He "laid the foundations of the earth;"[277] we have here the marking out of the material, but a mere chaos, "without form and void."[278] On this begins the action of the Creative Intelligence, the Holy Spirit, who "moved upon the face of the waters,"[279] the vast ocean of matter. Thus His was the first activity, though He was the Third Person--a point of great importance.