I think that line was in a Shakespeare play about one character trying to keep another from the truth. That line is very relevant today as Trump tries to keep us from finding out the full story of the January 6th insurrection.
Trump is going to try to hamstring the select committee by every legal and illegal means he can buy or coerce in hopes of thwarting their efforts in finding the truth. He has tried to prohibit his psychopaths from testifying. He is trying to keep the records and notes that pertain to their involvement secret by going to court.
He is fighting several criminal investigations and trying to keep most Republicans scared to go against him. A few like Kinzinger and Cheney are openly against him while many others are hoping he will go to jail or go away.
If Trump is as innocent as he, his Psychopaths, and his media friends proclaim then why the obstruction strategy? This has gone far past the Watergate cover-up. The greater the cover-up, the greater the crime.
Yes, he doth protest too much!