All of us are products of our childhood.

Live your life and forget your age.

A mother takes twenty years to make a man of her boy, and another woman makes a fool of him in twenty minutes.

Only he who accepts clashes and conflicts in life, loves life.

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

Never, ever underestimate the power of 'Id Like that.

Life is a tragedy when seen in close-up, but a comedy in long-shot.

It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is the most adaptable to change.

Exceptional claims demand exceptional evidence.

The more I see, the less I know for sure.

Crude classifications and false generalizations are the curse of organized life.

Being a hero is about the shortest-lived profession on earth.

Someone's sitting in the shade today because someone planted a tree a long time ago.

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

The pleasure of the moment begins to wither almost as soon as it blossoms; our pleasures are soon swallowed up in time's relentless torrent.

Science is the outcome of being prepared to live without certainty and therefore a mark of maturity. It embraces doubt and loose ends.

Anybody can dig a hole and plant a tree. But make sure it survives. You have to nurture it, you have to water it, you have to keep at it until it becomes rooted so it can take care or itself. There are so many enemies of trees.

Life is an ongoing process of choosing between safety (out of fear and need for defense) and risk (for the sake of progress and growth). Make the growth choice a dozen times a day.

History repeats itself, first as tragedy, second as farce.

I really had a lot of dreams when I was a kid, and I think a great deal of that grew out of the fact that I had a chance to read a lot.

Nature is not human-hearted.