Be resolute in your goals,
but flexible in your tactics.
- Jonathan Lockwood Huie

Every problem has in it the seeds of its own solution.
If you don't have any problems, you don't get any seeds.
- Norman Vincent Peale

Courage and perseverance have a magical talisman,
before which difficulties disappear and obstacles vanish into air.
- John Quincy Adams

You must do the things you think you cannot do.
- Eleanor Roosevelt

Where there's a will, there's a way.
- old English proverb

Sometimes the way to the pot of gold on the other side of the mountain is to keep fighting up the steep slippery slope, but often it is better to walk around the mountain. Also consider refocusing your attention on another pot of gold that is even larger, shinier, and virtually at hand.

In their own way, problems can be blessings.
They can be the prod to get us out of our complacency and into action.

Problems create an opportunity for us to exercise our ingenuity,
to plan, to persevere, to interact with our social network,
and to feel a sense of accomplishment when we finally overcome the unexpected roadblock.

In the midst of crisis, boldly seize opportunity.
- Jonathan Lockwood Huie

Further reading: Problem-Solving Abilities

Be Flexible

Another Door Opens

Rising Again