The desire for constant action irrespective of underlying conditions is responsible for many losses in Wall Street.

Investors
Jesse Lauriston Livermore
The "Boy Plunger" born in 1877 Massachusetts, who entered a Boston bucket shop at 14 and cycled through fortunes and bankruptcies on price action alone. A foundational figure in technical analysis.
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Jesse Lauriston Livermore's Other Quotes
I know from experience that nobody can give me a tip or a series of tips that will make more money for me than my own judgment.
The market does not beat them. They beat themselves, because though they have brains they cannot sit tight.
There is nothing new in Wall Street. There can't be because speculation is as old as the hills.
A man must believe in himself and his judgment if he expects to make a living at this game.
It was never my thinking that made the big money for me. It always was my sitting.
Related Quotes
By failing to prepare, you are preparing to fail.
-- Benjamin Franklin
Conceive optimistically, plan pessimistically, execute optimistically.
-- Kazuo Inamori
Choosing individual stocks without any idea of what you're looking for is like running through a dynamite factory with a burning match.
-- Joel Greenblatt
The market can stay irrational longer than you can stay solvent.
-- Jeremy Grantham
I try to invest in companies where the downside is limited and the upside is significant.
-- Bruce Berkowitz
I try to learn from every mistake. When we lose money, I want to understand exactly why we lost it.
-- David Einhorn