Maybe true travel is not the transportation of the body, but a change of perception, renewing the mind.
Study without desire spoils the memory, and it retains nothing that it takes in.
Education consists mainly of what we have unlearned.
Nothing in life is to be feared, it is only to be understood. Now is the time to understand more, so that we may fear less.
Man once surrendering his reason, has no remaining guard against absurdities the most monstrous, and like a ship without rudder, is the sport of every wind.
Space is big. You just won’t believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it’s a long way down the road to the chemist’s, but that’s just peanuts to space.
I am heartened to find so much wit in you, that you’d give thought to consequences and choose your way with reason, not passion only.
Never memorize something that you can look up.
A concept is a brick. It can be used to build a courthouse of reason. Or it can be thrown through the window.
Science cannot solve the ultimate mystery of nature. And that is because, in the last analysis, we ourselves are a part of the mystery we are trying to solve.