Manage your fears just as you manage your money.

Investing and financial management are always accompanied by greed and fear. Since people's reactions to losses are much more intense than to gains, fear can sometimes become more uncontrollable than greed.
There always seem to be fleeting opportunities in the market that make people lament, "If only I had bought or sold at that time, the current situation would be very different," leading some to make impulsive moves based on past missed opportunities.