The feeling of inferiority rules the mental life and can be clearly recognized in the sense of incompleteness and unfulfillment, and in the uninterrupted struggle both of individuals and humanity. – Alfred Adler

Exaggerated sensitiveness is an expression of the feeling of inferiority. – Alfred Adler

The greater the feeling of inferiority that has been experienced, the more powerful is the urge to conquest and the more violent the emotional agitation. – Alfred Adler