Jesus often taught the crowds that followed him using parables. A parable is a similitude, a comparison between two things, “i.e. a short story under which something else is figured or in which the fictitious is used to represent and illustrate the real” (G3850). When his disciples asked him what one of his parables meant, Jesus told them, “To you has been given to know the secrets of the kingdom of God, but for others they are in parables, so that ‘seeing they may not see, and hearing they may not understand.’” (Luke 8:10). Rather than helping his listeners to understand what he was saying, Jesus used parables to obscure the meaning of his lessons. The Greek word that is translated secrets in Luke 8:10, musterion (moos-tayˊ-ree-on) means “A mystery, i.e. something into which one must be initiated or instructed before it can be known; something of itself not obvious and above human insight” (G3466). Jesus told his disciples that it had been given to them “to know the secrets of the kingdom of God” (Luke 8:10). The type of knowing that Jesus was referring to “frequently indicates a relation between the person ‘knowing’ and the object known, in this respect, what is ‘known’ is of value or importance to the one who knows, and hence the establishment of the relationship…such ‘knowledge’ is obtained not by mere intellectual activity, but by operation of the Holy Spirit consequent upon acceptance of Christ” (G1097).

Jesus used the illustration of a lamp lighting a room to describe the effect of the Holy Spirit upon the mind of a believer. Jesus said, “No one after lighting a lamp covers it with a jar or puts it under a bed, but puts it on a stand, so that those who enter may see the light. For nothing is hidden that will not be made manifest, nor is anything secret that will not be known and come to light. Take care then how you hear, for to the one who has, more will be given, and from the one who has not, even what he thinks he has will be taken away” (Luke 8:16-18). Jesus indicated that a person’s beliefs are exposed by the spiritual light that the Holy Spirit provides. Even if we try to keep our beliefs a secret, they will eventually be manifested in the things we say and do. Jesus referred to this as bearing fruit and warned his followers, “Beware of false prophets who come to you in sheep’s clothing but inwardly are ravenous wolves. You will recognize them by their fruits. Are grapes gathered from thornbushes, or figs thistles? So, every healthy tree bears good fruit, but the diseased tree bears bad fruit. A healthy tree cannot bear bad fruit, nor can a diseased tree bear good fruit. Every tree that does not bear good fruit is cut down and thrown into the fire. Thus you will recognize them by their fruits” (Matthew 7:15-20).

One way of looking at the secrets of the kingdom of God is to see these secrets as spiritual truths that are necessary to comprehend God’s plan of salvation. If you know the secrets, you can fill in the blanks of God’s recorded message to humanity, the Bible. Matthew’s gospel goes farther in explaining this idea than what we find in Luke’s account. Matthew 13:10-17 states:

Then the disciples came and said to him, “Why do you speak to them in parables?” And he answered them, “To you it has been given to know the secrets of the kingdom of heaven, but to them it has not been given. For to the one who has, more will be given, and he will have an abundance, but from the one who has not, even what he has will be taken away. This is why I speak to them in parables, because seeing they do not see, and hearing they do not hear, nor do they understand. Indeed, in their case the prophecy of Isaiah is fulfilled that says:

“‘“You will indeed hear but never understand,
    and you will indeed see but never perceive.”
For this people’s heart has grown dull,
    and with their ears they can barely hear,
    and their eyes they have closed,
lest they should see with their eyes
    and hear with their ears
and understand with their heart
    and turn, and I would heal them.’

But blessed are your eyes, for they see, and your ears, for they hear. For truly, I say to you, many prophets and righteous people longed to see what you see, and did not see it, and to hear what you hear, and did not hear it.

Jesus attributed people’s inability to discern spiritual truth to a heart that has grown dull. In the context of the Holy Spirit being the light that illumines our minds and reveals spiritual truth, a heart that has grown dull is one that has turned the dimmer switch down so to speak so that the light is no longer sufficient to see things clearly. The Greek word that is translated dull, pachuno (pakh-ooˊ-no) is a derivative of the word pegnumi (paygˊ-noo-mee), which means “to fix (‘peg’), i.e. (special) to set up (a tent)” (G4078). The comparison of a dull heart to setting up a tent could have to do with the way our minds can get fixated or stuck on a single aspect of something that we are trying to understand and we are not be able to see beyond it.

John’s gospel often refers to Jesus using symbolic terms. John began by identifying Jesus as the Word that was with God when everything got started (John 1:1). John continued, “There was a man sent from God, whose name was John. He came as a witness to bear witness about the light, that all might believe through him. He was not the light, but came to bear witness about the light. The true light, which gives light to everyone, was coming into the world. He was in the world, and the world was made through him, yet the world did not know him. He came to his own, and his own did not receive him. But to all who did receive him, who believed in his name, he gave the right to become children of God, who were born, not of blood nor of the will of the flesh nor of the will of man, but of God” (John 1:6-13). John referred to Jesus as the true light, which gives light to everyone (John 1:9). The Greek word John used that is translated gives light, photizo (fo-tidˊ-zo) means “figuratively, to enlighten, shine light upon, to impart moral and spiritual light (John 1:9; Ephesians 1:18; Hebrews 6:4; 10:32); to illuminate, make one see or understand (Ephesians 3:9); to bring to light, make known (1 Corinthians 4:5; 2 Timothy 1:10). The reason why John linked together the two concepts of Jesus’ identity, Word and light is because they are essentially the same thing. The Word is the spiritual light that makes it possible for us to see or understand spiritual truths that are otherwise hidden in the scriptures.

Jesus explained that even though the light is available to everyone, some people do not want to understand the spiritual truths of the Bible because it will make them aware of their sin. Jesus said, “And this is the judgment: the light has come into the world, and people loved the darkness rather than the light because their works were evil. For everyone who does wicked things hates the light and does not come to the light, lest his works should be exposed. But whoever does what is true comes to the light, so that it may be clearly seen that his works have been carried out in God” (John 3:19-21). If you think of the secrets of the kingdom of God as unrevealed spiritual truths, then it makes sense that people could not perceive these truths until the necessary means of doing so was provided. Jesus said that people will be judged because the necessary means has been provided by him coming into the world. The illumination that results from Jesus coming into an individual’s life indicates whether or not that person actually wants to know the truth about himself.