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You should try to prevent errors of commission, not just errors of omission. This isn't very hard; it's obvious with hindsight. But you won't notice it until you've made one of these mistakes yourself.
It can be very difficult to separate your self-image from the way you think of other people, especially if they are close to you or in your family. The biggest challenge to finding peace of mind seems to be that we often assume that getting control of our own minds will also let us control others' minds.
There are two reasons to start a startup. One is because you want to build something, the other is because you want to change the world. The best startups don't have to be one or the other. They can be both building something and changing the world at the same time