The Doctor

"You can't rewrite time. You can only read it."

"The most important thing is the mission. Always the mission."

"I've been alive for 2000 years, and I've learned one thing: nothing is ever simple."

"Rose, this is important: if you ever catch yourself in a situation where you're unsure, just think: what would the Doctor do?"

"I can't save the world by making it cleaner. I can only save it by making it better."

"The question isn't what you're capable of. The question is what you're willing to do."

"I've lived long enough to know that the best victories are the ones where nobody has to die."

"Music is the universal language. It's math and beauty combined."

"There's a place I've been meaning to visit. It's called the future."

"I'm not lonely. I'm alone by choice."

"You can't judge a civilization by their buildings. You have to judge them by how they treat the smallest, weakest members of their society."

"I've seen the whole of space and time, and there's nothing—absolutely nothing—more beautiful than a person who chooses to be kind."

"Complacency is the enemy of progress."

"The way I see it, every storm eventually passes."

"I've forgotten more than most people will ever know."

"But they're gone, and I can't go back."

"I'm the Doctor. I've got a time machine and I know everything."

"Education is the most powerful weapon against ignorance."

"Never run unless you're being chased."

"I'm not a human. But I've tried to be one."

"The future is built on the choices we make today."

"You'll find I'm not a creature of habit. Unless you count traveling through time and space."

"The universe is bigger on the inside."

"I've come to the conclusion that people are wonderful."

"Leadership isn't about being in charge. It's about being responsible."

"I've been doing this for 900 years, and I haven't learned anything except that everyone's important."

"The dream of humanity has always been to reach for the stars."

"I'm not afraid of dying. I'm afraid of what I might become."

"The only way to understand the universe is to experience it."

"Peace is not the absence of war. Peace is the presence of justice."