Traditionally the first “step” of union with God is purgation. One of the definitions suggested by Google is “evacuation of the bowels brought about by taking laxatives.” For the follower of Jesus, it is simply being like Jesus who …

… ἑαυτὸν ἐκένωσεν μορφὴν δούλου λαβών, ἐν ὁμοιώματι ἀνθρώπων γενόμενος· καὶ σχήματι εὑρεθεὶς ὡς ἄνθρωπος

… made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men

Philippians 2:7 (KJV)

Other English translations use “empty himself” for κενόω. Maybe philosophically it is a little like “nihilism” – to become nothing? For the follower of Jesus is a choice to be “nothing” so God can create.