The Doctor: You can't rule the world in hiding. You've got to come out on the balcony sometimes and wave a tentacle, if you pardon the expression.
The Control Voice: It is said that if you move a single pebble on the beach, you set up a different pattern, and everything in the world is changed. It can also be said that love can change the future, if it is deep enough, true enough, and selfless enough. It can prevent a war, prohibit a plague, keep the whole world... whole.
Uncle Martin: After all as a very wise man once told me, the chicken is not infrequently the true dove of peace.