Thanks to Ben H. for the quotable quotes that make one think:

Wise men talk because they have something to say, fools, because they have to say something.

-- Plato

If A equals success, then the formula is: A =X+ Y+ Z;  X is work.  Y is play.  Z is keep your mouth shut.

-- Albert Einstein

Anyone who has never made a mistake has never tried anything new.

-- Albert Einstein

An expert is a person who has made all the mistakes that can be made in a very narrow field.

-- Niels Bohr

Gravitation cannot be held responsible for people failing in love,

-- Albert Einstein

We don't know a millionth of one percent about anything.

-- Thomas Alva Edison

All paid jobs absorb and degrade the mind

-- Aristotle

If I had my life to live over again, I’d be a plumber.

-- Albert Einstein

Things should be made as simple as possible, but not any simpler.

-- Albert Einstein

Never express yourself more clearly than you are able to think

Niels Bohr

I never think of the future.  It comes soon enough

-- Albert Einstein

It is the mark of an educated mind to be able to entertain a thought without accepting it.

-- Aristotle

The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!'(I found it!) but 'That's funny...'

-- Isaac Asimov

It is the supreme art of the teacher to awaken joy in creative expression and knowledge.

-- Albert Einstein

A table, a chair, a bowl of fruit and a violin; what else does a man need to be happy.

-- Albert Einstein

Put your hand on a hot stove for a minute, and it seems like an hour.  Sit uith a pretty girl for an hour, and it seems like a minute that’s relativity.

-- Albert Einstein

Only two things are infinite, the universe and human stupidity, and I'm not sure about the former

Albert Einstein

Common sense is the collection of prejudices acquired by age 18.

-- Albert Einstein

There are some things that are so serious you can only joke about them.

-- Niels Bohr

I cannot believe that God would choose to play dice with the universe or sometimes quoted as God does not play dice with the universe.

-- Albert Einstein

The most incomprehensible thing about the universe is that it is comprehensible.

-- Albert Einstein

Hell, there are no rules here—we’re trying to accomplish something.

-- Thomas Alva Edison

Peace cannot be achieved through violence, it can only be attained through understanding.

-- Albert Einstein

Just because something doesn't do what you planned it to do, doesn't mean it's useless.

-- Thomas Alva Edison

The only reason for time is so that everything doesn't happen at once.

-- Albert Einstein

Then anyone who leaves behind him a written manual, and likewise anyone who receives it, in the belief that such writing will be clear and certain, must be exceedingly simple-minded.

-- Plato

The wireless telegraph is not difficult to understand The ordinary telegraph is like a very long cat. You pull the tail in New York, and it meows in Los Angeles.  The wireless is the same, only without the cat.

-- Albert Einstein

History is the short trudge from Adam to atom.

-- Leonard Louis Levinson

My life is a simple thing that would interest no one.  It is a known fact that I was born and that is all that is necessary.

__ Albert Einstein

When asked how World War III would be fought, Einstein replied that he didn’t know.  Bid he knew how World War IV would be fought: With sticks and stones!

Irrigation of the land with sea water desalinated by fusion power is ancient.  It's called 'rain'.

- Michael McClary

Your theory is crazy, but it's not crazy enough to be true.

-- Niels Bohr to a young physicist

To inveta, you need a good imagination and a pile of junk

-- Thomas Alva Edison

The only source of knowledge is experience,

-- Albert Einstein

Opportunity is missed by most people because it is dressed in overalls and looks like work.

-- Thomas Alva Edison

There is no expedient to which a man will not go to avoid the labor of thinking.

Thomas Alva Edison