You are the light of the world. A town built on a hill cannot be hidden. Matthew 5:14
When we are born into this world, in life, we perceive physical light, and by it we learn of our Creator’s handiwork in the things we see. However, although that light is good, there is another Light, a Light so important that the Son of God had to come in order to both declare and impart it to men in settled process (Matthew 5:14; as a result of John 20:31; John 17:3, John 3:15).
There are two types of light in the world. We can perceive one, or both, or neither!
Physical light is necessary for physical life. The earth would certainly change very rapidly if there were no longer any sunlight. A forest full of trees with very thick canopies of foliage high above has very little plant life on the ground except for moss or lichen, which needs little sunlight. Plants will never move away from the light—they are said to be positively phototropic, drawn to the light. In the same way, spiritual light is necessary for spiritual life, and this can be a good test of our standing in Christ.
The believer will always tend toward spiritual things; he will always tend toward fellowship, prayer, the Word of God, and so on (John 4:24). The unbeliever always does the opposite (John 1:5; 3:19–20) because light exposes his evil, and he hates the light. Indeed, no man can come into the true spiritual light of Jesus Christ, unless he is enabled (John 6:37).