The influential German philosopher Immanuel Kant has traditionally been thought to be very critical of Swedenborg and his work, based on a book Kant wrote, Träume eines Geistersehers (Dreams of a Spirit-Seer).  However, close examination of the documents involved suggests that Kant had a more positive view of Swedenborg than has traditionally been thought.  For details, see the “Kant on Swedenborg” section of the Wikipedia entry on Swedenborg.