Why does knowing your purpose make reading more interesting

https://linc-ed.zendesk.com/hc/en-us/community/posts/360004105976--LIVE-TV-%E6%97%A5%E6%9C%AC%E3%82%AD%E3%83%AB%E3%82%AE%E3%82%B9%E3%83%A9%E3%82%A4%E3%83%96%E3%82%B9%E3%83%88%E3%83%AA%E3%83%BC%E3%83%9F%E3%83%B3%E3%82%B0%E6%94%BE%E9%80%81%E3%83%86%E3%83%AC%E3%83%93%E3%83%81%E3%83%A3%E3%83%B3%E3%83%8D%E3%83%AB%E3%82%A4%E3%83%B3%E3%82%BF%E3%83%BC%E3%83%8D%E3%83%83%E3%83%88%E3%83%93%E3%83%87%E3%82%AA%E8%A6%96%E8%81%B4%E7%84%A1%E6%96%99%E3%82%AA%E3%83%B3%E3%83%A9%E3%82%A4%E3%83%B32020%E5%B9%B411%E6%9C%8820%E6%97%A5

What do you mean by “your purpose”?