Doctor Who: The Edge of Destruction

‘He has a strange way of showing his kindness, Susan,’ said Barbara. There was no resentment in the statement; Barbara was merely pointing out a fact.

‘Maybe so,’ agreed Susan. ‘But you don’t know the terrible sort of life he’s had. He’s never had any reason to trust strangers before when even old friends have turned against him in the past; it’s so difficult for him to start now... But you and Ian are both good people; please, try and forgive him.’