Clues are underlined, and the spoiler is at the bottom.
A Point of Life -The Riddle
by Susan Ector Ward
I occupy a point.
The point is a location on a particular line.
The line is located on a particular plane.
Within the plane, I am occupying a location on an infinite number of other lines.
The location of my point is claimed by an infinite number of other planes each of which incorporates an infinite number of other lines whose path also claims my point.
My point is the center of an infinite sphere.
I may move in any direction along any of the infinite number of lines occupied by my point.
Successively and momentarily as I move, I will be occupying one of an infinite number of other points each one not only located on the line along which I move but also located on an infinite number of other lines and also located on an infinite number of other planes, few of which are occupied by the point at which I began.
As I move, each point whose location I occupy becomes the center of a new infinite sphere.
I may change my direction by choosing to move along any of the infinite lines whose path claims the point of my new location.
As I move, I find that I have influenced an infinite number of spheres whose center I have occupied.
If I move backward to retrace my path, though I will again pass through the center of every one of the infinite spheres whose center I had occupied before, I cannot influence any sphere in the same way I had influenced it before because I have been influenced by each of the infinite spheres along my path. The fact of my movement has changed me. Though I go back, neither I nor my point can ever be the same as we once were.
Who am I?
I am a living soul.