It could also be taken to mean, that we should take into consideration how these things will be looked at in "history books."
If all this is to come to pass as we hope it will, history will judge every move made by Sessions, DOJ, and The Donald. I believe that is the reason such extreme care is being taken to set the stage for events, legally, ethically, and politically.
Think big, bigger, biggest.
Thats it there...many today “know” that previous impeachments and other significant investigations were fake, false, trumped up because it was “just partisan politics.” If a Democrat prosecutes and burns a Democrat, that lends a great deal credence to the claims made now when viewed by later generations in hindsight.