Mark 4:11 - "And he said unto them, Unto you it is given to know the mystery of the kingdom of God: but unto them that are without, all these things are done in parables." (KJV)
I like that the King James Version of the Bible uses the word mystery. Other translations use the word secret. A secret sounds like it's something you don't want someone else to know. A mystery is something hidden that the originator of the mystery gives clues so that anyone who seeks the answer can find it.
God is that way. He doesn't want the hidden things of the kingdom to stay cloaked. However, he wants us to make the effort to put the clues together and find the answer, with Him helping all along the way. If the mystery stays hidden, it is because the seeker either gave up or wants to remain blind to the answer. Either way, God never stops giving clues and never stops cheering us on to find the answers.
Unlike Spam, God wants us to know what His kingdom contains.
John 15:7 (KJV) - If ye abide in me, and my words abide in you, ye shall ask what ye will, and it shall be done unto you.