fabricati-diem-pvnc:unwillingadventurer:One of the most powerful scenes.  It’s really the

fabricati-diem-pvnc:unwillingadventurer:One of the most powerful scenes.  It’s really the first time the Doctor talks about what he considers the rules of travelling back in time, and what you can and can’t do. The First era was very much about the Doctor as an observer. And very early on the Doctor was very adamant that history shouldn’t, and in fact couldn’t be re-written (They talk about the idea of being unable to change certain events in ‘The Reign of Terror’ too, and obviously the Space Museum is all about preventing a certain future)What makes it more interesting is placing the history teacher among the very history that she teaches. How can she resist the temptation to meddle, to make things better? But the Doctor is angry, and believes that things should remain as they are. Remember here he is still the traveller who rarely gets involved. The minute Ian and Barbara joined him, everything changed, and so too will the Doctor’s outlook on how he can be involved in history rather than just watching it.One thing that is intriguing is the ‘Believe me, I know’ line. Has the Doctor tried and failed to change something in his own experience? or is he merely trying to warn Barbara that there will be consequences? He says it’s impossible, so he seems to be under the assumption that no matter what you do, you cannot alter what is to be. Also love the bit with defiant Barbara. She is no longer the teacher, she is Yetaxa, you will obey!The line ‘Believe me, I know’ has always fascinated me, too. My headcanon goes along the first possibility, i.e. that he tried fixing something once and failed miserably (maybe hurting people he loves in the process), which is why he now so strictly adheres to a policy of non-interference. It is only the influence of his companions that mellows him over time, up to the point that he gets executed for his meddling in his second incarnation. -- source link

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