Many people mistakenly assume that RAMBAM (http://en.wikipedia.org/wiki/Maimonides) did not posses the wisdom of Kabbalah.
This belief can be understood as all the works of this great sage seem to be based on rational thinking. But this is only a veil that conceals one of the greatest Kabbalists the world ever known.
As one of the greatest masters of Kabbalah Abu Lafia (http://en.wikipedia.org/wiki/Abraham_Abulafia) pointed out – Kabbalah is based on two key books – Sefer HaYetzira that is attributed to Avraham and RAMBAM’s Guide.
I was troubled myself by the fact that ARIZAL implied in Shaar HaGilgulim that RAMBAM’s soul was derived from the left side of side-locks and therefore he didn’t merit to learn the Wisdom of Kabbalah, but the author of this article resolves this difficulty.