If a stock I own ever doubles, I sell half and put the proceeds into an index tracker. Knowing that I've got the money back and it's (relatively) safe makes it

If a stock I own ever doubles, I sell half and put the proceeds into an index tracker. Knowing that I've got the money back and it's (relatively) safe makes it much easier for me to be rational about how I treat the remainder. Obviously that might just be my own mindset...