no matter what asset class one held, there would come a time when it would lose most of its value. This included cash, which is the worst investment … - Ray Dalio

Being radically truthful and transparent with your colleagues and expecting your colleagues to be the same with you ensures that important issues are apparent instead of hidden. It also enforces good behavior and good thinking, because when you have to explain yourself, everyone can openly assess the merits of your logic.

Don’t let the little things divide you when your agreement on the big things should bind you.

From very early on, whenever I took a position in the markets, I wrote down the criteria I used to make my decision. Then, when I closed out a trade, I could reflect on how well these criteria had worked. It occurred to me that if I wrote those criteria into formulas (now more fashionably called algorithms) and then ran historical data through them, I could test how well my rules would have worked in the past. Here’s how it worked in practice: I would start out with my intuitions as I always did, but I would express them logically, as decision-making criteria, and capture them in a systematic way, creating a mental map of what I would do in each particular situation. Then I would run historical data through the systems to see how my decision would have performed in the past and, depending upon the results, modify the decision rules appropriately.