"Believe me child, your future lies with David and not with a silly old duffer like me... One day I shall come back. Yes. I shall come back. Until then, there must be no regrets, no tears, no anxieties. Just go forward in all your beliefs, and prove to me that I am not mistaken in mine."
- The Doctor, The Dalek Invasion of Earth: Flashpoint
(Boxing Day 1964)
Written by Terry Nation
(this speech also formed the pre-credit sequence to The Five Doctors, and featured in An Adventure in Space and Time)