Thoreau writes in his journal:
As the least drop of wine tinges the whole goblet, so the least particle of truth colors our whole life. It is never isolated, or simply added as treasure to our stock. When any real progress is made, we unlearn and learn anew what we thought we knew before. We go picking up from year to year and laying side by side the disjecta membra of truth, as he who picked up one by one a row of a hundred stones, and returned with each separately to his basket.
