“NO ADMITTANCE.NOT EVEN TO AUTHORISED PERSONNEL.YOU ARE WASTING YOUR TIME HERE.GO AWAY.”

“Life is wasted on the living.”

“Having not said anything the first time, it was somehow even more difficult to broach the subject the second time around.”

“It's good to leave your room super-messy when you're away. Whoever tries to break into your room will thought it has already been ransacked.”

“There are some people you like immediately, some whom you think you might learn to like in the fullness of time, and some that you simply want to push away from you with a sharp stick.”

“There’s no point in acting surprised about it. All the planning charts and demolition orders have been on display at your local planning department in Alpha Centauri for 50 of your Earth years, so you’ve had plenty of time to lodge any formal complaint and it’s far too late to start making a fuss about it now. … What do you mean you’ve never been to Alpha Centauri? Oh, for heaven’s sake, mankind, it’s only four light years away, you know. I’m sorry, but if you can’t be bothered to take an interest in local affairs, that’s your own lookout. Energize the demolition beams.”

“One of the main problems encountered in time travel is not that of accidentally becoming your own father or mother. There is no problem involved in becoming your own father or mother that a broadminded and well-adjusted family can’t cope with.”