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Thinking
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“
What is the hardest task in the world? To think.
Ralph Waldo Emerson
Intellect · 1841
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6
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“He who thinks little, errs much.”
Leonardo da Vinci
·
The Notebooks of Leonardo Da Vinci
, 1888 · Primary source
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Reasoning
7
Intellectual effort
1
Independent thought
8
Reflection
10
Judgement
29
Error
1