In Number Philosophy (Pythagoreanism), numbers are not just symbols but the fundamental stuff of reality.
Pythagoras taught that ``All is Number'', meaning the universe is constructed according to mathematical principles.
Numbers represent order, harmony, and proportion in the cosmos (e.g., musical scales, planetary motion).
They are considered the immutable, eternal essence that gives form to the formless matter.
Thus, understanding numbers is the key to understanding the divine structure of the universe.