Commentaries:
Many will seek to enter the Kingdom of God but be barred from it because of flagrant sin. Jesus will refuse to answer the knock of unruly sinners who have rejected salvation, though they weep and grind their teeth when they find out they cannot enter God's Kingdom. When the third resurrection arrives, all humanity will have had the opportunity to be saved; everyone's ultimate destiny will have been eternally set. It will be too late for anyone who, after coming to the knowledge of the truth, sins willfully and thereby rejects eternal life. Those who reject God and His way of life must then reap the consequences of that decision - the second death following the third resurrection to judgment.
Martin G. Collins
Basic Doctrines: The Third Resurrection