Your soul card goes a layer deeper than your personality card. Where the personality card shows how you manifest in the world, the soul card reveals who you truly are on the inside. It is the core of your being, the quiet force driving all your choices.
The soul card is calculated by adding the digits of your date of birth until a single digit remains (1-9). The difference from the personality card is that the reduction continues further. Sometimes your personality and soul card are the same, meaning your outer and inner self are perfectly aligned.