For Biden, there can be no going back. Even if there is inspiration to be taken from our past (he invokes, e.g., Lincoln and the Emancipation Proclamation), there also are injustices and iniquities there which fall short of our ideals and aspirations. The crooked timber of the past can be used for instruction or even inspiration, but it cannot deliver by itself the straight mast which our ship requires to navigate the current storm.
We must go forward. But how?