Here is the suspect’s explanation for what he tried to do:
Nicholas John Roske, 26, told police that he “began thinking about how to give his life purpose and decided that he would kill the Supreme Court Justice after finding the Justice’s Montgomery County address on the Internet,” court documents allege.
https://nypost.com/2022/06/08/nicholas-roske-found-brett-kavanaughs-address-online-feds-say/
Roske said he is taking medication, but did not say what it is or why he is on it.
https://nypost.com/2022/06/09/fbi-raids-home-of-nicholas-roske-in-brett-kavanaugh-case/