William Walker Atkinson 
Physiognomy 
How to Read Human Nature

Human Nature expresses itself in two general phases, i.e., (1) the phase of Inner States; and (2) the phase of Outer Forms. These two phases, however, are not separate or opposed to each other, but are complementary aspects of the same thing. There is always an action and reaction between the Inner State and the Outer Form—between the Inner Feeling and the Outer Expression. If we know the particular Inner State we may infer the appropriate Outer Form; and if we know the Outer Form we may infer the Inner State.