Suddenly, we humans - a ...

Suddenly, we humans - a recently arrived species, no longer subject to the checks and balances inherent in nature - have grown in population, technology and intelligence to a position of terrible power.
Suddenly, we humans - a recently arrived species, no longer subject to the checks and balances inherent in nature - have grown in population, technology and intelligence to a position of terrible power.
 Paul MacCready

More phrases

Effort only fully releases its reward after a person refuses to quit.
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 Napoleon Hill
Never complain and never explain.
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 Benjamin Disraeli
A good plan violently executed now is better than a perfect plan executed next week.
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 George S. Patton
Problems are not stop signs, they are guidelines.
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 Robert Schuller
Never give up, for that is just the place and time that the tide will turn.
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 Harriet Beecher Stowe

Quotes from the same author

Your grandchildren will likely find it incredible - or even sinful - that you burned up a gallon of gasoline to fetch a pack of cigarettes!
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 Paul MacCready