Discussion

Explanation:

The passage concludes with the statement –“To teach how to live without certainty, and yet without being paralyzed by hesitation, is perhaps the chief thing that philosophy, in our age, can still do for those who study it.” The purpose, therefore, is not to reduce uncertainty; rather, it is to help us deal with uncertainty and hesitation (ambiguity).
Option 2 reiterates this idea.
Option 3 comes close to the idea but does not mention dealing with ambiguity.
Options 1 and 4 can be eliminated. Although option 4 has been mentioned, it is not the purpose of philosophy.
Hence, the correct answer is option 2

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