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