The kingdom of heaven cannot be explained directly, immediately. It is impossible. Unless you enter it there is no way to say anything about it. Whatsoever is said will be wrong. The truth cannot be said. Then what are Jesus, Lao Tzu and Buddha doing continuously, for years? If the truth cannot be said, what are they doing? They are trying to explain something to you which cannot be explained, through some symbols which you know; trying to explain the unknown through the known. This is the most difficult thing in the world—parables, myths, stories.