If you haven't listened to this interview with Howard Marks you really should. He talks about market bubbles, not overpaying for stocks, investor excesses, no price too high, the futility of trying to buy at the bottom etc.
A super smart man and great investor. Well worth 40 minutes of any investors time. I am indebted to John Rosier for pointing me to this interview and hope he won't mind me sharing it with the Stockopedia community, after all investing is a collective endeavour. Hopefully the link below will work.