In The Light Of God's Word
All living things on earth are, one way or another, dependent upon sunlight. Plants, if deprived of light, or enough light, will die. Ironically however, the very same light that plants need for survival can also threaten their survival if the plant's root system is unable to meet the demands of its leaves, where photosynthesis takes place. Although all plants are susceptible, seedlings and transplants are those most often affected.
Jesus Christ used plants and sunshine in part of one of His parables in which those who "hath not root" wither in the Light of the Gospel:
"And He spake many things unto them in parables, saying, Behold, a sower went forth to sow ... Some fell upon stony places, where they had not much earth: and forthwith they sprung up, because they had no deepness of earth: And when the sun was up, they were scorched; and because they had no root, they withered away."
"But he that received seed into the good ground is he that heareth the word, and understandeth it; which also beareth fruit, and bringeth forth, some an hundredfold, some sixty, some thirty." (Matthew 13:3-6,23 KJV)
"Then shall the righteous shine forth as the sun"
Some people, as they study the Word of God, thrive in the Light of God's Word. They don't fear it, they aren't hostile to it, they humbly embrace it - from which they grow and flourish.
"For God, Who commanded the light to shine out of darkness, hath shined in our hearts, to give the light of the knowledge of the glory of God in the face of Jesus Christ." (2 Corinthians 4:6 KJV)
"Giving thanks unto the Father, which hath made us meet to be partakers of the inheritance of the saints in light: Who hath delivered us from the power of darkness, and hath translated us into the kingdom of His dear Son: In whom we have redemption through His blood, even the forgiveness of sins" (Colossians 1:12-14 KJV)
"Ye are all the children of light, and the children of the day: we are not of the night, nor of darkness." (1 Thessalonians 5:5 KJV)
Other people sometimes wither as they find themselves exposed to the Light. Some recover and go on to "produce a good crop," while others become weeds, or tares (see the Fact Finder question below) in God's field, of whom Jesus Christ made a dire warning in another of His parables. The parable also explains why God allows evil people to exist in the world, for now:
"Another parable put he forth unto them, saying, The kingdom of heaven is likened unto a man which sowed good seed in his field: But while men slept, his enemy came and sowed tares among the wheat, and went his way. But when the blade was sprung up, and brought forth fruit, then appeared the tares also."
"So the servants of the householder came and said unto him, Sir, didst not thou sow good seed in thy field? from whence then hath it tares?"
"He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up?"
"But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them. Let both grow together until the harvest: and in the time of harvest I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them: but gather the wheat into my barn."
"He answered and said unto them, He that soweth the good seed is the Son of man; The field is the world; the good seed are the children of the kingdom; but the tares are the children of the wicked one; The enemy that sowed them is the devil; the harvest is the end of the world; and the reapers are the angels."
"As therefore the tares are gathered and burned in the fire; so shall it be in the end of this world. The Son of man shall send forth his angels, and they shall gather out of his kingdom all things that offend, and them which do iniquity; And shall cast them into a furnace of fire: there shall be wailing and gnashing of teeth. Then shall the righteous shine forth as the sun in the kingdom of their Father. Who hath ears to hear, let him hear." (Matthew 13:24-30,37-43 KJV)
Fact Finder: What were, and are, "tares"?