Moshe ascended to God. As it says: you ascended on high and you took a captive. What does ‘you ascended’ mean? You prevailed in disputing with the supernal angels. Another explanation: you ascended on high - no creature succeeded on high in the way that Moshe did. Said Rebbi B’rechya: the tablets were six hands breadths long. In the hand, as it were, of the ‘one who spoke and there was a world’ was two hands breadths, two hands breadths were in Moshe’s hands and two hands breadths were left between hand and hand. (Shemot Rabbah 28:1)
Rebbi Sh’muel bar Nachman said in the name of Rebbi Yochanan: the tablets were six hands breadths long and three wide. Moshe grasped two hands breadths, God two, and two remained spare in the middle. When Yisrael did that deed, God wanted to grab them from Moshe’s hand, but Moshe’s hand prevailed and he grabbed them from Him. (Yerushalmi Shabbat 4:5)
The preparations of the heart are Man’s, but the answer of the tongue comes from God. (Mishley 16:1)
The preparations of the heart are Man’s - he organises his counsel and his words in his heart. But the answer of the tongue comes from God - when he comes to answer, God makes him wise with his words, or, should he merit, He prepares a good answer for him. (Rashi ad. loc.)
When God saw that the Jews had made the Golden Calf, he attempted to wrest the tablets from Moshe’s hands. We are encouraged to imagine that God realised that it would best if Man had no control over his actions if rebellion and idolatry is what he uses them for – this is the image of the Yerushalmi. Moshe, as it were, prevailed over God and succeeded in grabbing the tablets. This may be understood as God’s consent to Man trying again to control his own world. Despite the inherent dangers, God concedes that Man must be allowed to exercise his freewill once more, hence he allows Moshe to take the tablets.
The Shem MiShmuel gives this an interesting spin – he sees the tablets gradually moving from God’s sole possession to that of Moshe as key to his reading of the Midrash. Once one takes control of one’s actions (the part of the tablets that started in God’s hands), God will enable one to control one’s speech (the unheld part in the middle). Finally, it may even be possible to take charge of one’s thoughts. This is the project of the Torah, which, when applied to its maximum extent, enables one to elevate and manage every aspect of one’s experience.