***What does fullness mean in that/this context..***
The term “fullness of the gospel” refers to the whole doctrine of salvation demonstrated and taught in the ministry and life of Jesus Christ.
Jeeze.. Mark it could take a lifetime or more to absorb all that.. Some people havnt even recognized the message in communion yet.. or grasped "born again".. The multifarious wisdom of God is deep and calls out deep.. it takes "time"...