When people are oppressed, and human rights are denied - particularly along sectarian lines or ethnic lines - when dissent is silenced, it feeds violent extremism, it creates an environment that is ripe for terrorists to exploit. When peaceful, democratic change is impossible, it feeds into the terrorist propaganda that violence is the only answer available.

The Iranian regime supports violent extremists and challenges us across the region. It pursues a nuclear capability that could spark a dangerous arms race and raise the prospect of a transfer of nuclear know-how to terrorists. Its president denies the Holocaust and threatens to wipe Israel off the map. The danger from Iran is grave, it is real.

I'll be honest, there have been times when I've listened to the rhetoric in Europe where an easy equivalent somehow between the United States and Russia and between how our governments operate versus other governments operate, where those distinctions aren't made.

The ideas of ancient Greece helped inspire America's founding fathers as they reached for democracy. Our revolutionary ideas helped inspire Greeks as they sought their own freedom.

This is my number one priority. I've got a lot of things on my plate. But my top priority is to defeat ISIL and to eliminate the scourge of this barbaric terrorism that's been taking place around the world. Groups like ISIL can't destroy us. They can't defeat us. They don't produce anything. They're not an existential threat to us. It is very important for us to not respond with fear.

I know starting careers in troubled times is a challenge, but it is also a privilege. Because it's moments like these that force us to try harder, dig deeper and to discover gifts we never knew we had. To find the greatness that lies within each of us. So don't ever shy away from that endeavor. Don't stop adding to your body of work. I can promise that you will be the better for that continued effort as will be this nation that we all love.

Secularists are wrong when they ask believers to leave their religion at the door before entering into the public square. Frederick Douglass, Abraham Lincoln, Williams Jennings Bryan, Dorothy Day, Martin Luther King - indeed, the majority of great reformers in American history - were not only motivated by faith, but repeatedly used religious language to argue for their cause. To say that men and women should not inject their "personal morality" into public policy debates is a practical absurdity.