Many cultures — Mayan / Aztec, Chinese, Hebrew, Greek (Pythagorean) — had their own numerology systems and methods in different eras, most of which had different ways of adding and interpreting the numbers. This difference also applies to modern-day numerology systems. Which is the most correct and accurate? That you’ll need to determine for yourself.
An oracle (such as Tarot, the iChing, the Nordic runes) provide general images or words that the reader or end-user then interprets for themselves and their circumstance, projecting their own meanings, sensibility, and needs onto the particular approach.
The Life Purpose System is not an oracle — it is meant to be pretty specific as far as it goes (i.e. it does not, like other systems, translate someone’s name into numbers...). My book, The Life You Were Born to Live, especially the new edition, is considered the gold standard by many current numerologists.
I’m not here for you to trust me; I’m here to help you trust yourself. Check out the information I provide through the book / and app, then check out other (systems’) interpretations, and determine for yourself where you find the most useful insights.
— Dan Millman, author of The Life You Were Born to Live