Curiosity is one of the permanent and certain characteristics of a vigorous intellect.

Curiosity is the thirst of the soul.

As long as you are curious, you defeat age.

With us, the infantile inquisitiveness is strengthened and stretched out into our mature years. We never stop investigation. We are never satisfied that we know enough to get by. Every question we answer leads on the another question. This has become the greatest survival trick of our species.

If we lacked curiosity, we should do less for the good of our neighbor. But, under the name of duty or pity, curiosity steals into the home of the unhappy and the needy. Perhaps even in the famous mother-love there is a good deal of curiosity.

Curiosity and the urge to solve problems are the emotional hallmarks of our species ...

What had made me move through so many dead and pointless years was curiosity.