Final answer:
The 'little voice' you are referring to is known as the superego in Freudian psychology. It serves as your conscience and is responsible for feelings of guilt when you deviate from its moral standards.
Step-by-step explanation:
According to Freud, the little voice that tells you that you should always be polite and never hurt another person's feelings is the superego. The superego acts as our conscience, embodies our sense of morality, and is responsible for feelings of guilt when we act contrary to its dictates. It strives for perfection by judging our behavior and prompting feelings of pride or guilt in response to our actions.
The ego is the rational part of our personality that attempts to mediate between the desires of the id, which operates on the pleasure principle seeking immediate gratification, and the moral standards of the superego. The ego operates on the reality principle, ensuring that the needs of the id are met in realistic and socially acceptable ways.