Exactly...Obviously Jesus continued to heal people; probably of broken legs, stab wounds, pneumonia, toothache, etc...He did however teach us in the scriptures He provided and preserved everything we need to know for salvation...
John 16:12=15 I still have many things to say to you, but you cannot hear them now. When the Spirit of truth comes, he will guide you into all the truth; for he will not speak on his own, but will speak whatever he hears, and he will declare to you the things that are to come. He will glorify me, because he will take what is mine and declare it to you. All that the Father has is mine. For this reason I said that he will take what is mine and declare it to you.
It was not the original twelve, thirteen counting Paul who defined the doctrine of the Trinity.
It was not the original twelve, thirteen counting Paul who defined the deity/humanity of Christ.
It was not the original twelve, thirteen counting Paul, who rejected the many heresies that arose concerning the two natures of Jesus as true man and still truly God.
It was not the original twelve, thirteen counting Paul, who determined the canon of Scripture.
Those writing the New Testament did not know they were writing Scripture. To them Scripture was the Old Testament.
At what point did the Holy Spirit stop guiding us to truth?
Scripture certainly does contain all we need to know but does it contain all there is to know?