“We may be momentarily knocked off our feet but we'll pick ourselves up. We'll keep going. We will finish the race....This doesn’t stop us. And that’s what you’ve taught us, Boston. That’s what you’ve reminded us — to push on, to persevere, to not grow weary, to not get faint even when it hurts. Even when our heart aches, we summon the strength that maybe we didn't even know we had and we carry on; we finish the race. We finish the race because of who we are and we do that because we know that somewhere around the bend, a stranger has a cup of water. Around the bend, somebody’s there to boost our spirits. On that toughest mile, just when we think we’ve hit a wall, someone will be there to cheer us on and pick us up if we fall."
-- President Barack Obama, April 18, 2013, Boston, Massachusetts