We find more and more complex arrangements of machines that make it harder and harder to diagnose what's going on.

The harder it is to get to, the more people will value it.

Little wonder, then, that political leaders consistently personalize international conflicts. Alas, such commonplace language also makes wars harder to avoid, harder to end, and arguably more deadly.

And I'm trying harder and harder.

Now we'll make it harder, a little harder.

They tried harder, they persevered longer, and they were more resilient in the face of failure.

Hence, it must be harder. Well, it's not harder.

We get told that we need to study harder or be more focused or get a tutor.

And it's getting harder to hide assets, tax avoidance, pay inequality. So that's great. We're starting to find out more and more about these systems.

I also noticed that as I started to do more and harder 30 day challenges, my self confidence grew.

I also noticed that as I started to do more and harder 30 day challenges, my self confidence grew.

If that's true and it makes the future feel like something more distant and more different from the present, that's going to make it harder to save.

I'm going to push it a bit harder now, harder than I just pushed Chris.

You should study harder.

We should've worked harder.

We should've studied harder.

If we can find a way of becoming positive in the present, then our brains work even more successfully as we're able to work harder, faster and more intelligently.

But even as it got harder for him to walk and get dressed in the morning I saw him struggle more and more my father never complained about his struggle.

You should have worked harder.

But here's a harder question.

Is that easier or harder?

Same principles applied calculations, harder.

You should study English harder.

I'll try harder next time.

You should have studied harder.

I'm going to study harder.

From now on, try harder.

Next question, a little bit harder.

I want you to work harder.

I expect you to work harder.

And I started working harder, faster.

There are a bit harder issues.

You have to study Japanese harder.

He studies much harder than before.

They require me to work harder.

Let's try something a little bit harder.

Life is hard, but I am harder.

Were I you, I would study harder.

I inspired my students to work harder.

Work harder if you plan to succeed.

Maybe you should study harder next time.

And what I found is that most companies and schools follow a formula for success, which is this If I work harder, I'll be more successful.

That, of course, is much more interesting and harder to do. In a sense, it s the difference between matching words and understanding a piece of text.

And the second thing is confidence, that we can see how game playing and reward structures make people braver, make them more willing to take risks, more willing to take on difficulty, harder to discourage.

The Obama on display in the second debate and the third was harder, chillier, sadder, and more somber. There was tension in the lines of his mouth.