If you were not there it didn’t happen for you. If you did not experience it then you have no account of it. If you have no account of it, then you rely on the account of others to form a picture in your mind of it. It doesn’t matter what it is, you need to experience it directly to know it. Everything we experience is absolutely personal. We might be in the company of others under particular circumstances and experience a thing together, but we will have slightly different, or even radically different accounts of the event.