Volatile phases will come and go. While they are painful, these phases, if utilized to learn some lessons, will help avoid losses in the future. First and foremost, remember that when you buy a stock, you own a part of a business. And what business you own is more important than what is happening to the Nifty. Second, as a long-term investor, focus on whether the underlying business is witnessing change. And whether the change is positive or negative. Because it is the business which finally decides earnings and the stock price. So, let the Nifty and Sensex tango to global and domestic factors; focus on the business you are going to own.