Don't part with your illusions. When they are gone you may still exist, but you have ceased to live.
Exceptional claims demand exceptional evidence.
Anyone who lives within their means suffers from a lack of imagination.
Science is the outcome of being prepared to live without certainty and therefore a mark of maturity. It embraces doubt and loose ends.
All my life I have tried to pluck a thistle and plant a flower wherever the flower would grow in thought and mind.
If you break your neck, if you have nothing to eat, if your house is on fire, then you got a problem. Everything else is inconvenience.
Money is better than poverty, if only for financial reasons.
Each person must live their life as a model for others.
Life is not divided into semesters. You don't get summers off and very few employers are interested in helping you find yourself.
Amnesty is as good for those who give it as for those who receive it. It has the admirable quality of bestowing mercy on both sides.
People can tell you to keep your mouth shut, but that doesn't stop you from having your own opinion
The present is theirs; the future, for which I really worked, is mine.
If I'm honest I have to tell you I still read fairy-tales and I like them best of all.
The desire to fly is an idea handed down to us by our ancestors who... looked enviously on the birds soaring freely through space... on the infinite highway of the air
Sometimes - history needs a push.
You are not stuck where you are unless you decide to be.
Science is the most reliable guide for civilization, for life, for success in the world. Searching a guide other than the science is meaning carelessness, ignorance and heresy.
The only creatures that are evolved enough to convey pure love are dogs and infants.
If you don't design your own life plan, chances are you'll fall into someone else's plan. And guess what they have planned for you? Not much.
Short as life is, we make it still shorter by the careless waste of time.
Life can be pulled by goals just as surely as it can be pushed by drives.