Why could not Christ purify Judas Iscariot despite Judas being with Christ for three and half years.

Those sentences which are colored in orange are from Maharishi Dayananda Saraswati book Satyarth Prakash (The Light of Truth) and those which are colored in black are Jerry Thomas’s response.

"Then one of the twelve, called Judas Iscariot went unto the chief priests. And said unto them, what will ye give me, and I will deliver him unto you? And they covenanted with him for thirty pieces of silver." (26: 14, 15.)

C. Behold! All the Godhead and miraculous powers of Christ stand exposed! When he could not purify even the heart of his chief disciple who was in his constant company how could he purify others now that he is dead?

Oh! How many people, who put their faith and trust in him, are taken in since how could he who could not do any good to those who constantly associated with him while he was alive, benefit anyone after his death?

Answer: As per Maharishi, Judas Iscariot trusted in LORD Jesus Christ, yet he was not purified. Let us see what the Holy Bible says about it.

John 6:61-71 “When Jesus knew in Himself that His disciples complained about this, He said to them, "Does this offend you. What then if you should see the Son of Man ascend where He was before?  It is the Spirit who gives life; the flesh profits nothing. The words that I speak to you are spirit, and they are life. But there are some of you who do not believe." For Jesus knew from the beginning who they were who did not believe, and who would betray Him. And He said, "Therefore I have said to you that no one can come to Me unless it has been granted to him by My Father."  From that time many of His disciples went back and walked with Him no more. Then Jesus said to the twelve, "Do you also want to go away?"  But Simon Peter answered Him, "Lord, to whom shall we go? You have the words of eternal life.  Also we have come to believe and know that You are the Christ, the Son of the living God." Jesus answered them, "Did I not choose you, the twelve, and one of you is a devil?" He spoke of Judas Iscariot, the son of Simon, for it was he who would betray Him, being one of the twelve. 

Further, let us see how Judas conducted himself while being with LORD Jesus Christ.

John 12: 3-8 Then Mary took a pound of very costly oil of spikenard, anointed the feet of Jesus, and wiped His feet with her hair. And the house was filled with the fragrance of the oil. But one of His disciples, Judas Iscariot, Simon's [son], who would betray Him, said, "Why was this fragrant oil not sold for three hundred denarii and given to the poor?”  This he said, not that he cared for the poor, but because he was a thief, and had the money box; and he used to take what was put in it. But Jesus said, "Let her alone; she has kept this for the day of My burial. For the poor you have with you always, but Me you do not have always." 

In other words:

(a) Judas never trusted in the LORD Jesus Christ
(b) Judas used to steal money

So, the argument that Judas trusted in the LORD Jesus Christ and yet was not purified does not work in the clear verses of the Holy Bible.

In fact one of the warnings of LORD Jesus Christ when He selected disciples and taught them was as follows:

Matthew 7:15-23 "Beware of false prophets, who come to you in sheep's clothing, but inwardly they are ravenous wolves.  You will know them by their fruits. Do men gather grapes from thornbushes or figs from thistles? Even so, every good tree bears good fruit, but a bad tree bears bad fruit.  A good tree cannot bear bad fruit, nor [can] a bad tree bear good fruit.  Every tree that does not bear good fruit is cut down and thrown into the fire.  Therefore by their fruits you will know them.  "Not everyone who says to Me, 'Lord, Lord,' shall enter the kingdom of heaven, but he who does the will of My Father in heaven.  Many will say to Me in that day, 'Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonders in Your name?'  And then I will declare to them, 'I never knew you; depart from Me, you who practice lawlessness!' 

This warning while being against all false prophet, Judas Iscariot was a perfect example of this.