Attachment to God
Said the Besht: "Some seek God as if He were far removed from us, and surrounded by many walls. They say (Song of Songs 3:1): 'I sought Him but I found Him not.' Had they been wise, however, they would have known that 'no space is free of Him.' They can find Him in everything? and everywhere, and they should understand that 'one who attaches himself to any part of God is as if he were attached to the All in All."
Source: Meoroth ha-Gedolim