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During a speech about a Staten Island grand jury's failure to indict NYPD officer Daniel Pantaleo in the chokehold death of Eric Garner, Bill de Blasio shared a crushing personal anecdote: Even the mayor of New York has to have "the talk" with his black son about the interactions he'll have with police.

De Blasio said at a press conference this afternoon:

This is profoundly personal to me. I was at the White House the other day, and the president of the United States turned to me, and he met Dante a few months ago, and he said that Dante reminded him of what he looked like as a teenager. And he said I know you see this crisis through a very personal lens. And I said to him, I did.

Because Chirlane and I have had to talk to Dante for years about the dangers that he may face. A good young man, law-abiding young man who would never think to do anything wrong. And yet, because of a history that still hangs over us, the dangers he may face, we've had to literally train him—as families have all over this city for decades—in how to take special care in any encounter he has with the police officers who are there to protect him.

And that painful sense of contradiction that our young people see first, that our police are here to protect us, and we honor that, and at the same time, there's a history we have to overcome, because for so many of our young people, there's a fear. And for so many of our families, there's a fear.

So I've had to worry over the years. Chirlane's had to worry. Is Dante safe each night? There are so many families in this city who feel that each and every night. Is my child safe? And not just from some of the painful realities—crime and violence in some of our neighborhoods—but is safe from the very people they want to have faith in as their protectors.

That's the reality.

De Blasio also addressed #BlackLivesMatter:

It conforms to something bigger that you've heard come out in the protests in Ferguson and all over the country. This is now a national moment of grief, a national moment of pain and searching for a solution. And you've heard in so many places, people of all backgrounds utter the same basic phrase. They've said "Black lives matter." And they said it because it had to be said. It's a phrase that should never have to be said. It should be self-evident. But our history, sadly, requires us to say that black lives matter.