Consistent profitability is a corollary of the preservation of capital. Now what do I mean by a corollary? A corollary is an idea or a principle which is a direct consequence of another more fundamental principle. In this case, consistent profitability is a corollary of the preservation of capital because capital isn’t a static quantity-it is either gained or lost. To gain capital, you have to be consistently profitable; but to be consistently profitable, you have to preserve gains and minimize losses. Therefore, you must constantly balance the risks and rewards of each decision, scaling your risk according to accumulated profits or losses, thereby increasing the odds of consistent success.

– Victor Sperandeo, Methods of a Wall Street Master