"And so it came to pass on Christmas Day, that the human race did cease to exist. But even then, the Master had no concept of his role in greater events. For this was far more than humanity's end! This was the day upon which the whole of creation would change forever! This was the day... the Time Lords returned. For Gallifrey! … For victory! … For the end of Time itself!"
January 1, 1970
https://en.wikiquote.org/wiki/Rassilon