The Lord Jesus had such great love for His disciples, that He longed for the eleven He was standing with, as he prayed, to be with Him and to experience His glory. Listen what He says to the Father.
"Father, I desire that they also, whom You have given Me, be with Me where I am, so that they may see My glory which You have given Me, for You loved Me before the foundation of the world. " John 17:24
His love and His desire for them to be with Him, was not directed to only those eleven, but also to us; the ones that would believe the disciples words about Him.
"Neither pray I for these alone, but for them also which shall believe on Me through their word." John 17:20
But how sad it was that the twelfth disciple did not heard the High Priestly pray we have in John 17. He was not with them, because, in chapter 13, he had walked out and it was dark. It seems to me that Jesus wanted to include him, He said that the twelve would sit upon twelve thrones, judging the twelve tribes of Israel. And Jesus had washed Judas' feet along with the other eleven. It seems that He had a great love for Judas, and made ever effort to win him.
"And Jesus said unto them, 'Verily I say unto you, That ye which have followed me, in the regeneration when the Son of man shall sit in the throne of his glory, ye also shall sit upon twelve thrones, judging the twelve tribes of Israel.'" Matthew 19:28
How sad it would be if you failed to occupy that place Jesus has prepared for you in His glory. He loves you and longs to be with you, and for you to see His glory. Whatever it cost, do not miss that.