Some quotes that for one reason or another resonate...

There should be no element of slavery in learning. Enforced exercise does no harm to the body, but enforced learning will not stay in the mind. So avoid compulsion, and let your children's lessons take the form of play.
Human nature is not a machine to be built after a model, and set to do exactly the work prescribed for it, but a tree, which requires to grow and develop itself on all sides, according to the tendency of the inward forces which make it a living thing.
John Stuart Mill via Johnnie Moore
Results are obtained by exploiting opportunities, not by solving problems.
Peter F Drucker
There is something you should understand about the way I work. When you need me but do not want me, then I must stay. When you want me but no longer need me, then I have to go.
Nanny McPhee
...so many great truths must be very gently introduced, with voices soft and the truths themselves understated.
Neale Donald Walsch via Euan
The first principle is that you must not fool yourself – and you are the easiest person to fool.
Richard Feynman
The pencil is mightier than the pen.
Robert Pirsig - Zen And The Art Of Motorcycle Maintenance
Is it hard? -- Not if you have the right attitudes. It's having the right attitudes that's hard.
Robert Pirsig - Zen And The Art Of Motorcycle Maintenance
If you want to build a ship, don’t drum up people together to collect wood and don’t assign them tasks and work, but rather teach them to long for the endless immensity of the sea.
Antoine de Saint-Exupery via Bob Marshall
You keep using that word. I do not think it means what you think it means.
Inigo Montoya in The Princess Bride via Tom Graves
To make matters worse, in order to ride a bike, you have to be willing to embrace its precariousness.
Nicholas Day
You have to have an idea of what you are going to do, but it should be a vague idea.
Pablo Picasso
You can't just ask customers what they want and then try to give that to them.
Steve Jobs
Price is what you pay. Value is what you get.
Warren Buffett
You must be the change you wish to see in the world.
Mohandas Gandhi
The intuitive mind is a sacred gift and the rational mind is a faithful servant. We have created a society that honours the servant but has forgotten the gift.
Albert Einstein
There is a difference between knowing the path and walking the path.
Morpheus (the one in The Matrix not the Greek God)
Attitude is a little thing that makes a big difference.
Winston Churchill
It is not necessary to change. Survival is not mandatory.
W Edwards Deming
Don't worry about people stealing your ideas. If your ideas are any good, you'll have to ram them down people's throats.
Howard Aiken
Everything should be as simple as it is, but not simpler.
Albert Einstein
This task was appointed to you, Frodo of the Shire. If you do not find a way, no one will.
Galadriel - Lady of Lórien
Simple rules lead to complex behavior. Complicated rules lead to stupid behavior.
Eli Gothill on twitter
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man.
George Bernard Shaw
In a knowledge economy there no such thing as conscripts, there are only volunteers. The trouble is we have trained our managers to manage conscripts.
Peter Drucker
Eliminate numerical quotas.
W Edwards Deming
Do or do not. There is no try.
Look deep into nature, and then you will understand everything better.
Albert Einstein
Management by objective works - if you know the objectives. Ninety percent of the time you don't.
Peter Drucker
No, I will not calm down!
Hermione Granger
I wanted to change the world. But I have found that the only thing one can be sure of changing is oneself.
Aldous Huxley
All lasting business is built on friendship.
Alfred A. Montapert
As a small businessperson, you have no greater leverage than the truth.
John Greenleaf Whittier
We always overestimate the change that will occur in the next two years and underestimate the change that will occur in the next ten. Don't let yourself be lulled into inaction.
Bill Gates
Shut up! [Vikings stop] Bloody Vikings! You can't have egg bacon spam and sausage without the spam.
Waitress (or at least Terry Jones dressed as a waitress)
The illiterate of the future will not be the person who cannot read. It will be the person who does not know how to learn.
Alvin Toffler

And, just to underline the point...

In times of change the learners will inherit the earth while the knowers will find themselves beautifully equipped to deal with a world that no longer exists.
Eric Hoffer