Too often, we have confused hospitality with blindness. Not all of those we’ve opened our doors to have come to France with a love of our way of life. Today, under pressure from a European Union that renders us weaker and less free, France faces a cruel reality: It only takes a dozen terrorists—some French in nationality, but not spirit, and others capitalizing on the poorly managed migrant crisis—to take the lives of at 129 of our countrymen. It is up to us to affirm, without hesitation, that France’s freedom was built over centuries intentionally and collectively. That’s what defines a nation.