At Sinai, He said, “Let us bond together. Let us embrace in these mitzvahs, commune in this Torah, and in them we will be one.”
But He is an infinite, unknowable G‑d. If we cannot know Him, how can we bond with Him?
And so, when He came to us in His Torah at Mount Sinai, He began with an alef. And when we begin to learn, we begin with an alef.
In that first, infinitesimal point of not knowing, in that is contained all wisdom.
Leil Simchat Torah 5736:16.