I notice how during the vision of Revelation . . . first, it appears John was not ready to see Jesus . . . if Revelation means he fell down because of fear > Revelation 1:17. But Jesus tells John he needs to not fear . . . a possible correction.
Also, later, we see how . . . right during the vision of Revelation, John becomes unspiritual enough to worship an angel . . . certainly a sin > Revelation 19:9-10, Revelation 22:8-9.
So, John was not perfect; but because he was so close to God, he got more closely corrected!
Now . . . about this correction testified in Hebrews 12:4-11 > this correction brings the perfection of God's love > making us "partakers of His holiness" in His love's "peaceable fruit of righteousness", as this scripture plainly says. So, the focus of our Father's correction is not only on do's and don'ts and no-no pleasures, then, I would say. But how we become in love is essential >
"Love has been perfected among us in this: that we may have boldness in the day of judgment; because as He is, so are we in this world." (1 John 4:17)
And I think Philippians 2:13-16 can help to feed us how to become more and more mature in God's love, so we "have boldness in the day of judgment; because as He is, so are we in this world." So, I consider that our Biblical assurance of salvation is not that we said a prayer, or that we can put together verses of Bible assurance, but our assurance is how our Father is correcting us and curing our nature in His love so we are "as He is" "in this world" - - - "that we may have boldness in the day of judgment", John says.