And this explains that which is brought down in the Medrash that the מִטַּל הַּשָמַּיִם 'Dew of heaven' refers to the written Torah, וּמִשְמַּנֵּי הָאָרֶּץ the 'Fats of the earth' refers to the 'Mishnah' דָגָן ‘corn’ refers to the 'Talmud'.
Seemingly, this is not understood because even without Yitzchok's blessing, the Torah would have been given to Yisroel, since the whole intention of creation from the very beginning, was so that Yisroel shall receive the Torah, as can be seen from the condition that HaShem made with the 'Creation’ "If Yisroel accept the Torah etc." So in which way were they blessed with the Torah?
There is a known explanation to this that Yitzchok's blessing was that as a result of toiling in Torah a greater spiritual level than the level of Torah itself can be attained. Because, the Torah itself is the wisdom of HaKodosh Boruch Hu, and even greater it is ‘Chochmoh Sesimo’oh’ but as a result of the 'Toil' in Torah, a 'Toil' in a manner of 'Reflected Light' one can ultimately arrive at the הֶּעְלֶּם הָעַּצְמִי (of Torah) like the Possuk says: עַּיִן לֹא רָאָתָה אֱלֹהִים זוּלָתְךָ "No eye had ever seen a G-d besides You".
