The slowness of evolution, of human cultural progress, testifies to the effectiveness of that brake — material inertia — which so efficiently operates to retard dangerous velocities of progress. Thus does time itself cushion and distribute the otherwise lethal results of premature escape from the next-encompassing barriers to human action. For when culture advances overfast, when material achievement outruns the evolution of worship-wisdom, then does civilization contain within itself the seeds of retrogression; and unless buttressed by the swift augmentation of experiential wisdom, such human societies will recede from high but premature levels of attainment, and the “dark ages” of the interregnum of wisdom will bear witness to the inexorable restoration of the imbalance between self-liberty and self-control. 118:8.6
https://mm.spiritualfamily.net/Urantia_Book-Online_Reader-2019/Paper_118.html#118:8.6