Luke 8:18 KJV
Take heed therefore how ye hear: for whosoever hath, to him shall be given; and whosoever hath not, from him shall be taken even that which he seemeth to have.
In the context it is obvious the possession is the light of life, eternal life. It is received through hearing (the Word of God) and some hear it, but have not fully received it.
Jesus said take heed how ye hear. Having pastored these many years I have witnessed a number of ways people might hear the Word.
Some hear with the intellect.
They look for doctrinal accuracy; they strain to hear that thing they believe gives cause to criticize the preacher.
Some hear for entertainment.
They have favorite preachers and judge one to be better than another based upon their ability to stir and keep a crowd.
Some hear impatiently.
They are busy over a number of things even while the Word is preached.
Some hear passively.
Their ears no doubt note the voice, but the message is not getting through.
Others hear spiritually.
The Word that is preached takes root even while it is preached. They are encouraged or convicted or instructed or stirred by the Word itself.
Jesus then said of this possession that those that have it will get more of it; a saved person grows. But those who only seem to have it will lose that part they seem to have.
A person should take heed right here.
Some seem to have this light of life, but Jesus said they do not have it in fact.
• It might be others believe they are possessors of eternal life.
• It might be they believe themselves to be possessors of eternal life.
But they only seem to have it. And in the end, they will lose even that which they seemed to have.
Take heed; do we possess the light of Jesus Christ or do we merely think we have it?