What does "their worm and their thirst will never be quenched" mean?

I am searching for lessons on the synoptic gospels. I hope to answer the following questions: 1. Why are three so similar and John is not 2. What specific stories are told in Matthew, Luke and Mark and how are they similar and how are they different? 3. Why are Matthew, Mark and Luke referred to as the synoptic gospels? Can you provide some resources to answer my questions?

Please define and explain the characteristics of the soul and the spirit of man.

This question deals with the sign gifts of Mark 16 (snake handling, drinking deadly poison) and 1 Corinthians 14.

Is it ok to seek a sign from God? Doesn't seeking a sign indicate lack of faith?

Why did Jesus turn the water to wine (besides the fact the people had ran out) and why was it his first miracle?

Who was Melchizedek? Is this an appearance of Jesus Christ in the Old Testament or was this someone else?

Why does the bible refer Jesus the son of David? Although it can refer to the biological and immediate son of an earthly father, it can also have other meanings.

Why can't people today, heal as Christ instructed the disciples to do? I am not sure what I think of these so called healers you see on television? Was this gift only for the Kingdom period and not for us during the Grace age. I know God can heal through our prayer.

Benny Hinn, John Hagee, Rod Parsley and many others from TBN practice healing and speaking in tongues along with other things. Is this scriptural?