People who refuse to quit are usually either trying to prove someone wrong or refusing to admit they are wrong. - Shane Parrish

When you see someone doing something that doesn’t make sense to you, ask yourself what the world would have to look like to you for those actions to make sense.

Far more probability estimates are wrong on the “over-optimistic” side than the “under-optimistic” side. You’ll rarely read about an investor who aimed for 25% annual return rates who subsequently earned 40% over a long period of time. You can throw a dart at the Wall Street Journal and hit the names of lots of investors who aim for 25% per annum with each investment and end up closer to 10%.

if you find yourself biting your tongue in group situations, if you find yourself or your team resisting change or continuing to do something in one way simply because that’s how you’ve always done it in the past — be on your guard! The inertia default is likely at work.