If we are unable to find the moon in the night sky, a kind friend may point out a tree in our immediate field of vision, and singling out a particular branch, guide us to see “the moon on the branch.”
Evidently, both our kind friend and we understand that the moon is not actually on the branch —the pointing process is only a skillful means to help us perceive the moon directly with our own eyes.
All principles are to be understood in this way. They are not the truth, fixed and immutable; they merely point to the truth. They are pointing principles.