Interview with Eric Sprott, billionaire investor. I think many of his comments are releveant to us here:

"And you got to stick to your beliefs, that’s the other thing. I mean yes, I’ve taken some big down hits this year. But when I think of where we could go from here, and I’ve done it before, I’ve done it so many times I can’t even tell you…I might have been bullish and [everyone] thought we were in a bear market and it turns out to be a bull market. I’m going back over 40 to 50 years now. So that’s a lot of time. If you believe you’re right and the data says hold your ground, you hold your ground. Normally there’s a pretty big payday at the end"

http://bullmarketthinking.com/full-transcript-billionaire-eric-sprott-%E2%80%9Cyou-have-to-be-a-buyer-when-people-are-non-believers/