In the old testament, We see God had Secrets that he kept from his followers, to be revealed later. The Bible is a progressive book, and shows that God revealed to those who believed in Him just what they needed to be justified by faith. See “Mystery Doctrine of” the “Mysteries of God”. But let’s begin with the Secrets:
Deuteronomy 29:29 The secret things belong unto the LORD our God: but those things which are revealed belong unto us and to our children forever, that we may do all the words of this law.
When Manoah (Samson’s Father) asked the angel of the LORD (God in flesh) for his name, JUDGES 13:18, he was told: “And the angel of the LORD said unto him, Why askest thou thus after my name, seeing it is secret?”.
Even Eliphaz the Temanite challenged Job, JOB 15:8 “Hast thou heard the secret of God? and dost thou restrain wisdom to thyself”?
God reveals his Secrets to Believers Psalm 25:14 “The secret of the LORD is with them that fear him; and he will shew them his covenant.”
This is stated in Proverbs 3:32 “For the froward is abomination to the LORD: but his secret is with the righteous.”
And again in Isaiah 45:15 “I have not spoken in secret, in a dark place of the earth: I said not unto the seed of Jacob, Seek ye me in vain: I the LORD speak righteousness, I declare things that are right.”
And in Isaiah 48:16 “Come ye near unto me, hear ye this; I have not spoken in secret from the beginning; from the time that it was, there am I: and now the Lord GOD, and his Spirit, hath sent me.”
An example of God revealing Secrets is found in Daniel 2:30 “But as for me, this secret is not revealed to me for any wisdom that I have more than any living, but for their sakes that shall make known the interpretation to the king, and that thou mightest know the thoughts of thy heart.”
And in Amos 3:7 “Surely the Lord GOD will do nothing, but he revealeth his secret unto his servants the prophets.”
Even Christ Jesus tried to reveal Secrets to His followers Matthew 13:35 “That it might be fulfilled which was spoken by the prophet, saying, I will open my mouth in parables; I will utter things which have been kept secret from the foundation of the world.”
And to Paul was given the revelation of the mysteries and secrets which had been kept since the world began BUT now revealed to all believers.
Romans 16:25 “Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began,”