On my desktop right in front of me I have a few sticky notes taped to the bottom of my monitor. A few months ago I started writing down witty market truisms whenever I read or heard them, and then putting them in a place where I can see them. It sounds lame, but every now and then when I’m stressing out about a stock or a decision (to buy or sell), one of these catches my eye and gives me some clarity. Some examples include “It’s hardest to keep things simplest,” “Only egotists and fools try to pick...