I am a conservative because I know that no one of us is better than any other one of us.

[Donald] Trump is a [Hillary] Clinton Christmas gift.

I was naming the five warriors of our generation who have experience, four out of five I would argue were retired early out of the [Barack] Obama administration because they said things the Obama administration didn't particularly want to hear.

There are kind of four people up at the top, [Donald] Trump,[Marco] Rubio,[Ted] Cruz,[Ben] Carson, and then there's me and about three governors. I'm perfectly happy with that position right now, honestly, because when I started this race, I was 17 out of 16. The pollsters didn't even ask my name, because so few people knew me.

We need to enact fundamental tax reform. The weight and complexity of our 73,000-page tax code are crushing everyday Americans. We need to radically simplify the tax code so that we can re-start the real engine of growth in our economy. That means our tax code needs to go from 73,000 pages down to about three pages.

So what will define greatness for your generation? I believe it is to use the knowledge that you have earned here to find ways, not only to connect to computers, but to connect to people; not only to bridge gaps in science, but to bridge gaps between cultures; not only to use numbers and formulas to create, but to use words to lead, and in the process, to close that canyon between ignorance and understanding.

Nobody needs to worry about my toughness.