Philosopher by Most Well-Known Idea

Given a brief "sound bite" of well-known Western philosophy, guess the corresponding thinker

These may not be the most important contributions these philosophers have made, but they are phrases that many people immediately associate with them

I am looking for the philosopher most commonly associated with the idea, even if it is widely misattributed (I've put asterisks next to the names in this case so as not to mislead anyone).

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Last updated: October 6, 2017

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First submitted	October 6, 2017
Times taken	47
Average score	60.0%
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Hint	Philosopher
I think, therefore I am	Rene Descartes
The life of man [is] solitary, poor, nasty, brutish, and short.	Thomas Hobbes
Right to life, liberty, and property	John Locke
Best of all possible worlds	Gottfried Leibniz
More things should not be used than are necessary.	William of Occam*
God is dead	Friedrich Nietzsche
Religion is the opium of the people.	Karl Marx
Greatest good for greatest number of people	Jeremy Bentham*
Invisible hand	Adam Smith
Allegory of the cave	Plato
There is but one truly serious philosophical problem, and that is suicide.	Albert Camus
Here is one hand, and here is another.	George Edward Moore
We are condemned to be free	Jean-Paul Sartre
If a tree falls in the forest...	George Berkeley*
Scientific method	Francis Bacon