"More than an unspeakable human tragedy, this is an assault on what makes this the greatest city in the world: our inclusiveness and our diversity," he said Wednesday. "Now it's our collective responsibility to speak clearly and forcefully in the face of intolerance and violence — here or across the country. We are a safe city because we are inclusive. We are a nation of unrivaled strength because we are diverse. No act of violence can undermine who we are."