Rashi, in a comment on the first verse of Parashat Mishpatim, explains the curious phrasing of the pasuk as a lesson from God: God sends Moshe a message that Moshe shouldn't let the thought even cross his mind that he is merely to  teach Bnei Yisrael what to do and then walk away without explaining the reasoning behind it. Rather,  he is to "place [the mitzvot] before them” like a set table.  Bnei Yisrael also have to know the reasons behind the laws. As in Parashat Yitro, there is an emphasis on empowering the people to deal with issues on their own, without having to run to Moshe each and every time something comes up.