“It is not enough to think about difficult problems one way. You need to think about them forwards and backwards. “Indeed,” says Munger, “many problems can’t be solved forward.”
“(Jacobi) knew that it is in the nature of things that many hard problems are best solved when they are addressed backward,” Munger counsels.
From the Farnham Street Blog: https://www.farnamstreetblog.com/2013/10/inversion/