The unprepared mind cannot see the outstretched hand of opportunity.

The time may come when penicillin can be bought by anyone in the shops. Then there is the danger that the ignorant man may easily underdose himself and by exposing his microbes to non-lethal quantities of the drug make them resistant.

Rule No. 1: Never lose money. Rule No. 2: Never forget Rule No. 1.

-- Warren Buffett

An expert is a man who has made all the mistakes which can be made, in a narrow field.

-- Niels Bohr

A new scientific truth does not triumph by convincing its opponents, but rather because its opponents eventually die and a new generation grows up familiar with it.

-- Max Planck

Finally we shall place the Sun himself at the center of the Universe.

-- Nicolaus Copernicus

The present is theirs; the future, for which I really worked, is mine.

-- Nikola Tesla

Mathematics is the alphabet in which God has written the universe.

-- Galileo Galilei