The concept that the universe is a large, strange & interesting place for those who have Awakened and can truly see it. 1st Edition started with a lot of Cosmic Weirdness, 2nd Edition less while Revised & Mage20 have very little. Downplayed when Brucato took over. He feared it was too abstract to have mass appeal.
When mages Awaken to magic, the supernatural world awakens to them. Low level magick allows mages to create comfortable lives for themselves so why not sit back & take it easy? Revised Edition didn't address this well. It assumed mages wanted power over other mages so they would get involved with mage groups. Stewart Wieck's original view of Mage assumed mages couldn't take it easy because the supernatural world wouldn't leave them alone.