God IS unjust if those He didn't give it to are still required to have it!
God IS unjust for commanding those He did not give the ability to receive it... to receive it!
Joh 1:12 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
Joh 1:13 Which were born, not of blood, nor of the will of the flesh,
nor of the will of man, but
of God.
Joh 6:28 Then said they unto him, What shall we do, that we might work the works of God? Joh 6:29 Jesus answered and said unto them,
This is the work of God, that ye believe on him whom he hath sent.
Faith is a work of God in John 6:28.
Mat 3:11 I indeed baptize you with water unto repentance: but he that cometh after me is mightier than I, whose shoes I am not worthy to bear: he shall baptize you with the Holy Ghost, and with fire: Mat 3:12 Whose fan is in his hand, and he will throughly purge his floor, and gather his wheat into the garner; but he will burn up the chaff with unquenchable fire.
Joh 6:37 All that the Father giveth me shall come to me; and him that cometh to me I will in no wise cast out.
Joh 6:43 Jesus therefore answered and said unto them, Murmur not among yourselves. Joh 6:44 No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day. Joh 6:45 It is written in the prophets, And they shall be all taught of God. Every man therefore that hath heard, and hath learned of the Father, cometh unto me.
Joh 6:64 But there are some of you that believe not. For Jesus knew from the beginning who they were that believed not, and who should betray him.
Joh 6:65 And he said, Therefore said I unto you, that no man can come unto me, except it were given unto him of my Father.