Final answer:
Stevenson's quote underlines the humanistic concept that fulfilling basic physiological needs is a prerequisite for personal growth and freedom.
Step-by-step explanation:
Adlai Stevenson's statement, "A hungry man is not a free man," reflects the importance of basic needs as a feature of the humanistic approach to personality. This approach, notably represented by Abraham Maslow's hierarchy of needs, suggests that basic physiological needs like food and shelter must be met before higher-level psychological needs, such as self-actualization, can be pursued. Maslow's theory has been influential in highlighting how unmet basic needs can inhibit an individual's ability to grow and achieve their full potential.