If you want to see something done, just tell some human beings it can't be done. Make it known that it's impossible to fly to the moon, or run 100 meters in 9.9 seconds, or solve Fermat's Last Theorem. Remind the world that no one has ever hit 62 home runs in a season or stuffed 18 people into a Volkswagen. Dangle the undoable in front of the world. Then, consider it done.--Merrill Lynch advertisement 

If you're successful in what you do over a period of time, you'll start approaching records, but that's not what you're playing for. You're playing to challenge and be challenged.--Lou Brock 

It's lack of faith that makes people afraid of meeting challenges, and I believe in myself.--Muhammad Ali 

I've learned that you'll never be disappointed if you always keep an eye on uncharted territory, where you'll be challenged and growing and having fun.--Kirstie Alley 

The key to life is accepting challenges. Once someone stops doing this, he's dead.--Bette Davis 

Life's challenges are not supposed to paralyze you, they're supposed to help you discover who you are.--Bernice Johnson Reagon 

The marvelous richness of human experience would lose something of rewarding joy if there were no limitations to overcome. The hilltop hour would not be half so wonderful if there were no dark valleys to traverse.--Helen Keller 

Not every challenge has to be dealt with on Monday. That's what Tuesday, Wednesday, Thursday and Friday are for!-Lawrence Spindel 

Of all the virtues we can learn, no trait is more useful, more essential for survival, and more likely to improve the quality of life than the ability to transform adversity into an enjoyable challenge.--Mihaly Csikszentmihalyi 

Opportunities to find deeper powers within ourselves come when life seems most challenging.--Joseph Campbell 

A powerful idea communicates some of its strength to him who challenges it.--Marcel Proust (Remembrance of Things Past) 

Providence has hidden a charm in difficult undertakings, which is appreciated only by those who dare to grapple with them.--Anne-Sophie Swetchine 

There are no great people in this world, only great challenges which ordinary people rise to meet.--William Frederick Halsy, Jr. 

There's always room for improvement, you know--it's the biggest room in the house.--Louise Heath Leber 

Though our challenges are fearsome, so are our strengths. Americans have ever been a relentless, questioning, hopeful people.-- Bill Clinton (Inauguration speech, 20 Jan 1993) 

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

Troubles are usually the brooms and shovels that smooth the road to a good man's fortune.--St. Basil 

The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands in times of challenge and controversy.--Martin Luther King, Jr. 

The way we see the world shapes the way we treat it. If a mountain is a deity, not a pile of ore; if a river is one of the veins of the land, not potential irrigation water; if a forest is a sacred grove, not timber; if other species are biological kin, not resources; or if the planet is our mother, not an opportunity -- then we will treat each other with greater respect. Thus is the challenge, to look at the world from a different perspective.--David Suzuki 

What is genius, anyway, if it isn't the ability to give an adequate response to a great challenge?--Bette Greene 

Whatever course you have chosen for yourself, it will not be a chore but an adventure if you bring to it a sense of the glory of striving, if your sights are set far above the merely secure and mediocre.--David Sarnoff 

When we least expect it, life sets us a challenge to test our courage and willingness to change; at such a moment, there is no point in pretending that nothing has happened or in saying that we are not yet ready. The challenge will not wait. Life does not look back. A week is more than enough time for us to decide whether or not to accept our destiny.--Paulo Coelho (The Devil and Miss Prym) 

When we long for life without difficulties, remind us that oaks grow strong in contrary winds and diamonds are made under pressure.--Peter Marshall 

You do not need to know precisely what is happening, or exactly where it is all going. What you need is to recognize the possibilities and challenges offered by the present moment, and to embrace them with courage, faith and hope.--Thomas Merton 

You must do the thing you think you cannot do.--Eleanor Roosevelt (

Courage is going from failure to failure without losing enthusiasm. Winston Churchill

Always do the things you fear the most. Courage is an acquired taste, like caviar. Erica Jong

Lean into (not away from) what’s making you uncomfortable. Shane Parrish

Amateurs are scared – scared to be vulnerable and honest with themselves. Professionals feel like they are capable of handling almost anything. Shane Parrish (fs.blog)

Will you dare to try and learn and grow? Or will you allow fear to take over? Life happens in the river, not on the shore. Maxime Lagacé

Accept in an unruffled spirit that which is inevitable. Seneca

It’s better to cross the line and suffer the consequences than to just stare at the line for the rest of your life. Paulo Coelho

Running away from the immediacy of our experience is like preferring death to life. Pema Chödrön

The only alternative to a shuddering paralysis is to leap into action regardless of the consequences. Alan Watts

If you’re not in the arena also getting your ass kicked, I’m not interested in your feedback. Brené Brown

The hard choices – what we most fear doing, asking, saying – these are very often exactly what we most need to do. Tim Ferris

Think of yourself as an explorer. You cannot find anything new if you are unwilling to leave the shore. Robert Green