The young people think the old people are fools - but the old people know the young people are fools.

If you want a happy ending, that depends, of course, on where you stop your story.

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.

I am not young enough to know everything.

We cannot live better than in seeking to become better.

Speed and efficiency do not always increase the quality of life.

The 'good old times'-all times, when old, are good.

This thing of being a hero, about the main thing to it is to know when to die.

We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology.

Some days you're the bug, some days you're the windshield.

History is a set of lies agreed upon.

Whether I shall turn out to be the hero of my own life, or whether that station will be held by anybody else, these pages must show.

Every time I see an adult on a bicycle, I no longer despair for the future of the human race.

The most important thing to do if you find yourself in a hole is to stop digging.

Wrinkles should merely indicate where the smiles have been.

Symbols are the imaginative signposts of life.

Until you make the unconscious conscious, it will direct your life and you will call it fate.

Stop acting as if life is a rehearsal. Live this day as if it were your last. The past is over and gone. The future is not guaranteed.

Life is a journey, not a destination.

We keep moving forward, opening new doors, and doing new things, because we're curious and curiosity keeps leading us down new paths.

Even when you think you have your life all mapped out, things happen that shape your destiny in ways you might never have imagined.