Joseph says he was tempted by the monetary value of the plates.
Joseph Smith, History, circa Summer 1832, 5, The Joseph Smith Papers website, accessed August 11, 2021
I had been tempted of the advisary and saught the Plates to obtain riches and kept not the commandme[n]t that I should have an eye single to the Glory of God therefore I was chastened and saught diligently to obtain the plates and obtained them not untill I was twenty one years of age . . .