Once I read an article which talked about Exodus 31:18 and compared it with Exodus 34:1. In the first verse G-d gave the tablets (His work, His writing, 32:16), the second verse teaches Moshe needed to provide the tablets for G-d to write upon them His words (Deuteronomy 9:10). The article tried to show some development by showing that Moshe first received the Torah passively, then the second time actively; by cooperating and participating in the process. What I liked about it was the contrast and the teaching build around it; teaching how one could develop oneself by being active and involved in receiving Torah.
I can't find the article anymore, so I hoped to find some commentaries or studies which teach similar things.