Here's a few of my favorites from Mr. Edison:
As a cure for worrying, work is better than whisky.
Everything comes to him who hustles while he waits.
Hell, there are no rules here-- we're trying to accomplish something.
I never did a day's work in my life. It was all fun.
If we all did the things we are capable of doing, we would literally astound ourselves.
Just because something doesn't do what you planned it to do doesn't mean it's useless.
Many of life's failures are people who did not realize how close they were to success when they gave up.
Opportunity is missed by most people because it is dressed in overalls and looks like work.
Results! Why, man, I have gotten a lot of results. I know several thousand things that won't work.
There is no expedient to which a man will not go to avoid the labor of thinking.
To invent, you need a good imagination and a pile of junk.
We don't know a millionth of one percent about anything.
I have not failed. I've just found 10,000 ways that won't work.
Genius is one per cent inspiration, ninety-nine per cent perspiration.
This one's from Spock:
"If you eliminate the impossible, whatever remains, however improbable, must be the truth."
...And a couple of my own (not that I'm comparing myself to Thomas):
"We've always done it this way" loosely translates to "we've always been pretty stupid".
I wish I didn't know then what I don't know now.