If they bring a knife to the fight, we bring a gun. - Barack Obama

But we do not have to think that human nature is perfect for us to still believe that the human condition can be perfected. We do not have to live in an idealized world to still reach for those ideals that will make it a better place. The non-violence practiced by men like Gandhi and King may not have been practical or possible in every circumstance, but the love that they preached - their faith in human progress - must always be the North Star that guides us on our journey.

For if we lose that faith - if we dismiss it as silly or naïve; if we divorce it from the decisions that we make on issues of war and peace - then we lose what is best about humanity. We lose our sense of possibility. We lose our moral compass.

We are blessed to live in the greatest nation on Earth. But we can always be greater. We can always aspire to something more. That doesn’t depend on who you elect to office. It depends on you, as citizens, how big you want to be, and how badly you want it. Look at all America has accomplished. Look at how big we’ve been. I dare you to do better. I dare you to be better. From what I have seen of your generation, I have no doubt you will. I wish you courage, and compassion, and all the strength you need for that tranquil and steady dedication of a lifetime. Thank you, God bless you, and God bless the United States of America.

Yes, in our world, old thinking can be a stubborn thing. That's one of the reasons why we need term limits -- old people think old ways. […] The old ways can be stubborn. But I believe the human heart is stronger. I believe hearts can change. I believe minds can open. That’s how change happens. That’s how societies move forward. It's not always a straight line -- step by halting step -- sometimes you go forward, you move back a little bit. But I believe we are marching, we are pointing towards ideals of justice and equality.