Quotes from Warren Buffett

We simply attempt to be fearful when others are greedy and to be greedy only when others are fearful.
Warren Buffett - Greed - Fear - Investing

Wide diversification is only required when investors do not understand what they are doing.
Warren Buffett - Stock Market - Investing - Knowledge

Only buy something that you'd be perfectly happy to hold if the market shut down for 10 years.
Warren Buffett - Stock Market - Long Term Investing