Jamieson, Fausset and Brown on Jeremiah 29:8

8. your dreams which ye caused to be dreamed--The Latin adage says, "The people wish to be deceived, so let them be deceived." Not mere credulity misleads men, but their own perverse "love of darkness rather than light." It was not priests who originated priestcraft, but the people's own morbid appetite to be deceived; for example, Aaron and the golden calf (Ex 32:1-4). So the Jews caused or made the prophets to tell them encouraging dreams (Jr 23:25, 26; Ec 5:7; Zec 10:2; Joh 3:19-21).