"|Barnabus| was a good man, and full of the Holy Ghost and of faith." (Acts 11:24)

"If a soul commit a trespass, and sin through ignorance, in the holy things of the Lord." (Leviticus 5:15)

The "shadow of things to come" (Colossians 2:17) in the Old Testament focuses on physical items and places that were considered especially holy and dedicated.

"Who is like unto thee, O LORD, among the gods? who is like thee, glorious in holiness, fearful in praises, doing wonders?" (Exodus 15:11)

God is the greatest communicator, always revealing exactly what He wants us to know about Himself, about one another, and about the world around us. Romans 1:20 gives assurance that every person in the world can know that God exists:

When the plain sense makes common sense, seek no other sense.
-- M. R. De Haan (1891-1965), Founder of the Radio Bible Class