Even if personal experience is not thought to be a proof of anything, for me it does some weight to the approach of the Gra. In the approach of the Gra, learning Torah, even one single word of Torah, is considered to be equal to all the other commandments of the Torah. [This is actually what it says in the Gemara Yerushalmi on that mishna in Peah.] Thus you would hope and expect that after learning Torah lishma [for its own sake] for some years, one would merit to some sort of "Devekut" attachment with God.
For me this actually happened in an instant as I decided to take my family with me to Israel. The second we got off the plane and the wind blew on me, this kind of Devekut began.
And during later times I began to see how the Gra was right in many other ways.
So even if it is desirable not to speak about the depth of one's experience in attachment with God by learning Torah, still if you do not mention it at all, it is kind of like the prohibition of כובש נבואתו.[I forget the actual verse, but the idea is a prophet is not allowed to hide his prophecy.] And one ought not to give the impression that the path of learning and keeping and understanding Torah is intellectual. The truth is the path of the Gra of learning Torah for its own sake is the highest level of spirituality that is possible. Or at least let me say that that is what I have seen.
