This collection holds 376 challenged quotes, drawn from writers, leaders, artists and thinkers across the QuoteForever archive. The most quoted voices here are Peter Drucker, Joely Fisher and Jackie Joyner-Kersee.

They are ordered so that each author has a say before anyone repeats, which means the first page gives you the range of the topic rather than one writer's back catalogue. Quotes that come with a ready-made image appear first, so anything you want to share is one tap away.

Use the grid and list views to change how much of each quote you see, follow an author's name to read everything else they said, or open a quote on its own page to copy it, share it, or turn it into a picture quote.

Knowledge has to be improved, challenged, and increased constantly, ... - Peter Drucker

Knowledge has to be improved, challenged, and increased constantly, or it vanishes.

I like to be challenged.

I'm always challenged by someone.

To grow, people need to be challenged.

If you're not challenged, you'll get bored.

You're supposed to be challenged in college.

I've been basically challenged my whole life.

We're not lost. We're locationally challenged.

Censorship in all its forms must be challenged.

Poverty and lack of knowledge must be challenged.

As an actor I like to be challenged all the time.

I made lots of talks and challenged lots of people.

I like being challenged. That's the only way you grow.

Any artist should stay challenged as long as possible.

I think as an actor you want to keep being challenged.

Normally, when a fighter gets challenged, they answer.

I love to act, and I try to be challenged by what I do.

You see who the real people are when they're challenged.

I am very rewarded and challenged in front of the camera.

I love being challenged, goofing off, and lots of passion.

I want to keep on the move, keep stimulated and challenged.

People are tired of simple things. They want to be challenged.

Hollywood forgets easily. I want to be fulfilled and challenged.

To be challenged means to strive. I'm almost certain that's true.

I think, like most actors, it's really exciting to be challenged.

I love, when I feel challenged, to step up to my highest capacity.

One thing about being in Metallica is I've always felt challenged.

If one does not fail at times, then one has not challenged himself.

To be tested is good. The challenged life may be the best therapist.

I was a bit challenged when I was younger to stay on the right path.

I like characters that make me feel challenged and sort of inspired.

If you don't get challenged, then you can't find out how good you are.

I like this job. I like doing it. It's good to be challenged like that.

Boris Johnson needs to be challenged, with passion, heart and precision.

I had never been so challenged in an airplane that I doubted the outcome.

You tend to find the best in yourself as an artist when you're challenged.

The problem was just a mean attitude that festers and has to be challenged.

After 'Superstar,' I was encouraged. I felt audiences wanted to be challenged.

I have serious hearing loss. I'm challenged if I don't have my hearing aids in.

School reform is not enough. The notion of schooling itself must be challenged.

Dancers, like all performing artists, like nothing better than to be challenged.

It's amazing: when you are challenged with less, sometimes you can produce more.

We have grown comfortable not having our perspective challenged. It's unhealthy.

People want to see big, escapist fare. They don't want to be challenged to think.

We're not going to go 82-0 and blow everybody out. We are going to be challenged.

One doesn't want to feel too contented; you have to feel challenged by the music.

Y2K has challenged a belief in digital technology that has been almost religious.

Once, even the simple metal needle challenged the conventional thinking of a time.

Coronavirus has challenged daily life in Britain in a way not seen for generations.

I just I don't feel challenged by acting anymore. I don't enjoy the process anymore.

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