Writing for the court, Stanley v. Georgia, 394 U.S. 557 (1969)
“Secondly, the educated citizen has an obligation to serve the public. He may be a precinct worker or President. He may give his talents at the courthouse, the State house, the White House. He may be a civil servant or a Senator, a candidate or a campaign worker, a winner or a loser. But he must be a participant and not a spectator. "At the Olympic games," Aristotle wrote, "it is not the finest and strongest men who are crowned, but they who enter the lists-for out of these the prize-men are elected. So, too, in life, of the honorable and the good, it is they who act who rightly win the prizes."”
1963, Address at Vanderbilt University
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John F. Kennedy 469
35th president of the United States of America 1917–1963Related quotes
1963, Address at Vanderbilt University
                                        
                                        As quoted in Art of Communicating Ideas (1952) by William Joseph Grace, p. 389 
Disputed
                                    
                                        
                                        Source: Social Problems (1883), Ch. 21 : Conclusion 
Context: Many there are, too depressed, too embruted with hard toil and the struggle for animal existence, to think for themselves. Therefore the obligation devolves with all the more force on those who can. If thinking men are few, they are for that reason all the more powerful. Let no man imagine that he has no influence. Whoever he may be, and wherever he may be placed, the man who thinks becomes a light and a power. That for every idle word men may speak they shall give an account at the day of judgment, seems a hard saying. But what more clear than that the theory of the persistence of force, which teaches us that every movement continues to act and react, must apply as well to the universe of mind as to that of matter? Whoever becomes imbued with a noble idea kindles a flame from which other torches are lit, and influences those with whom he comes in contact, be they few or many. How far that influence, thus perpetuated, may extend, it is not given to him here to see. But it may be that the Lord of the Vineyard will know.
                                    
                                        
                                        Southam v Smout [1964] 1 QB 308 at 320.
Denning was quoting William Pitt, 1st Earl of Chatham 
Judgments
                                    
                                        
                                        Speech on November 4th at "Law not War" rally in Trafalgar Square, London, during the Suez crisis of 1956. 
1950s
                                    
1890s, Plessy v. Ferguson (1896)