PaRDeS is an acronym for the different levels of interpreting the Torah. Rabbi Ariel Bar Tzadok writes an essay on the legend of the four Rabbis who enter PaRDeS but only one makes it back successfully. This is typically given to students of Kabbalah as they prepare to approach the esoteric levels of Jewish Kabbalah. I read this essay many years ago and it has stuck with me ever since to help me stay grounded in my research and approach my findings with the wisdom gleaned from this teaching.
Follow-up Oracle of the Phoenix with the study of the Zohar (Splendor) as offered by scholar Daniel Matt who authors the Pritzker edition translation. Sign-up for classes and listen to the archives by checking out the facebook group Zohar Zoom at https://www.facebook.com/groups/382202722521430/