The difficulty of training one’s thoughts lies not so much in developing new ideas but in escaping the old.
Guy Spier mentioned this idea in the podcast, which is originated from Warren Buffet and Charlie Munger. Kevin Kelly also quoted a similar thing like “You are only as young as the last time you changed your mind” in the article 99 Additional Bits of Unsolicited Advice. I covered some bits in Weekly I/O #23.
I highly recommend anyone interested in Guy Spier to listen to this podcast episode. Even though they didn’t cover much about investing, it showcased how nice and humble Guy Spier is. I found his personality quite charming and seems to be rare compared to most other investors (judged by what I learned from the book Richer, Wiser, Happier).