If I had permitted my failures or what seemed to me at the time a lack of success to discourage me I cannot see any way in which I would ever have made progress.
I think it's realistic to have hope. One can be a perverse idealist and say the easiest thing: 'I despair. The world's no good.' That's a perverse idealist. It's practical to hope because the hope is for us to survive as a human species. That's very realistic.
