La fortuna juega a favor de una mente preparada

Did you ever observe to whom the accidents happen? Chance favors only the prepared mind.

Virulence appears in a new light which cannot but be alarming to humanity; unless nature, in her evolution down the ages (an evolution which, as we now know, has been going on for millions, nay, hundreds of millions of years), has finally exhausted all the possibilities of producing virulent or contagious diseases - which does not seem very likely.

As in the experimental sciences, truth cannot be distinguished from error as long as firm principles have not been established through the rigorous observation of facts.

Intuition is given only to him who has undergone long preparation to receive it.

When I approach a child, he inspires in me two sentiments; tenderness for what he is, and respect for what he may become.

To know how to wonder and question is the first step of the mind toward discovery.