Another of my favorite quotes.
Even in an upward trend you still have pullbacks meaning little downward movement here and there.
So if your account balance is not sufficient to contain this "irrational" market behavior you're gonna get stopped out pretty early.
This is why its important to trade lot sizes you can afford to fund.
This is also one of the main reasons many traders are unprofitable: because they trade with little capital.
Their capital cannot keep up with the markets irrationality.