Rav Hirsch talks of the fact that the two mountains, Grizim and Eival - one where blessing were read, one where curses were read - at the start looked the same. One flourished and one didn't. That's the way it is with blessings and curses. They can germinate from the same equal playing field, but the final results reveal the great difference between actions that in the end lead to holiness and blessing, or G-d Forbid, the opposite.