Why does God keep a secret until He is ready to reveal it?
God keeps His secret until His appointed time so that, when He reveals it, mankind is expected to believe it. The mystery was hid in the mind of God from the beginning of the world, and He unveils it only when ready, requiring faith in what He now makes known.
Les explains that Ephesians 3 speaks of the mystery not made known to the sons of men as it is now revealed. This brings up the whole concept of the secret that God keeps until He is ready to reveal it, and when He reveals it, He expects mankind to believe it. The mystery, this body of truth, has been hid in the mind of God from the beginning of the world, the same God of Ephesians 3 who is also the God of Genesis 1.
Which in other ages was not made known unto the sons of men, as it is now revealed unto his holy apostles and prophets by the Spirit;