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 (You Learn by Living)

Be who you are and say what you feel, because those who mind don’t matter, and those who matter don’t mind.” ― Bernard M. Baruch

You may not control all the events that happen to you, but you can decide not to be reduced by them.” ― Maya Angelou, Letter to My Daughter