Matthew 13:35
[This was] so that what was spoken by the prophet would be fulfilled, when he said [Psa. 78:2], "I will open my mouth [to speak] with parables. I will say things that have been hidden from the beginning of time."
Romans 16:25-26
Now may there be glory for ever, through Jesus Christ, to the only wise God, who is able to make you stand firm [in the faith], according to the good news and proclamation of Jesus Christ. This message is the secret which was [eventually] revealed, after having been kept quiet about for long ages.
1 Corinthians 2:9-11
But as it is written [Isa. 64:4], "The things which no eye saw or ear heard, and which did not [even] enter the mind of men, is what God has prepared for those who love Him."
Ephesians 3:5
which was not told to people of previous generations as it has now been revealed to His [i.e., Christ's] holy apostles and prophets by the Holy Spirit.