With the help of social media, people can now share ideas much faster than in Martin Luther King Jr.'s "I have a dream" era. It is unlikely, however, that any of the hundreds of millions of ideas we share each day will ever have as much of an impact or longevity as King's.
Even 40 years later, King's pleas for peace and equality of opportunity are fresh in our nation's social consciousness. On his eponymous holiday Monday, Twitter users celebrated King with some of his best quotes.
Scroll through the gallery above to read these famous words. Which King quote is your favorite? Let us know in the comments below.