Final answer:
Joseph McNeil lived by his words by participating in the 1960 Greensboro Sit-ins, directly defying segregation laws and inspiring a nationwide movement against racial injustice.
Step-by-step explanation:
Joseph McNeil, one of the Greensboro Four, embodied the principle of taking a stand against injustice. By sitting at a segregated lunch counter in 1960, an act which sparked the Sit-in Movement across the United States, McNeil directly challenged the widespread segregation and discrimination of the era. This action, along with subsequent activism, demonstrated McNeil's commitment to taking personal responsibility and actively combating unethical and immoral treatment of African Americans, just as he advocated for others to do when witnessing wrongs.