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" 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. "
― Ray Dalio , Principles: Life and Work
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" In a nutshell, I was looking for meaningful work and meaningful relationships. I quickly learned that the best way to do that was to have great partnerships with great people. To me, great partnerships come from sharing common values and interests, having similar approaches to pursuing them, and being reasonable with, and having consideration for, each other. At the same time, partners must be willing to hold each other to high standards and work through their disagreements. The main test of a great partnership is not whether the partners ever disagree—people in all healthy relationships disagree—but whether they can bring their disagreements to the surface and get through them well. Having clear processes for resolving disagreements efficiently and clearly is essential for business partnerships, marriages, and all other forms of partnership "
― Ray Dalio , Principles: Life and Work
