If you want to kill any idea in the world, get a committee working on it.
The only time you mustn't fail is the last time you try.
Don't be afraid to stumble. Any inventor will tell you that you don't follow a plan far before you strike a snag. If, out of 100 ideas you get one that works, it's enough.
People see the wrongness in an idea much quicker that the rightness.
One fails forward toward success.
Nothing ever built arose to touch the skies unless some man dreamed that it should, some man believed that it could, and some man willed that it must.