Personality and Soul Cards

Contrary to popular belief, these concepts were not developed by Mary Greer, but by Arrien Angeles in "The Tarot Handbook", a book which does not get the credit it is due in my opinion. She also presents several similar concepts in the book. such as growth cards and growth cycles.

Personality Card - this card represents your expression in the outer world, your talents, gifts, resources and how others see you.
To find this card, add your birth day, month and year together.
Example: Sept 9th, 1956 = 9 + 9 + 1956 = 1974
then add the digits of the result together - 1 + 9 + 7 + 4 = 21.
This is your personality card. If it is a double digit reduce it again: 2 + 1 + 3. This is your soul/spiritual card.
The soul card represents the deepest core of who you are. It provides an internal base of energy and natural resource for you to draw upon for your personality expression. If the first result is more than 21 like mine:

June 6th, 1956 - 6 + 6 + 1956 = 1968, 1 + 9 + 6 + 8 = 24 (note this is more than 21), reduce it again, 2 + 4 = 6.
This both my personality and soul card.