Since I was a child I had this 'rule' that says that is ok to make as many mistakes as possible, as long as they are not the same. Fail often but differently every time. Never fail in the same way twice. Failing is a part of the learning process, and we should not be afraid of failure.

I think it was because I read a story, true or not, about Edison trying and failing to make a light bulb more than a hundred times, but each time different. That 'each time different' stuck with me.