80180
In the 19th century , philosopher Arthur Schopenhauer argued that teaching some ideas to children at a young age could foster resistance to doubting those ideas later on .
 Arthur Schopenhauer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Arthur Schopenhauer