Knowledge and Happiness are different things.

Some people actually believe that they could be happy if they had a better knowledge of something (may be life). All people who believe that, will go learning new things until they fall into the pit of misery, when they forget everything they have learned.

Then they might restart the same process.

Knowledge needs support of a group of similar minds. It could not be harnessed by a single being. Humans aren't made that way.

 Happiness on the other hand lies in the moments, and the memories of it. It is also multiplied in the group of similar people.