God has progressively revealed His plans through covenants and prophecies and the very living Word of God, Jesus Christ was the
completion of God's promises and the last revelation.
As John, one of the twelve disciples, has written,
　He came to that which was his own did not receive him,
in John's Gospel which starts with the words,
　In the beginning was the Word, and the Word was with God,
　　　　　　　　　　　　　　　　　　　　and
　　　　　　　　　　　　　　　the Word was God,
so the Jews who had been awaiting the literal fulfillment of all
promises in the Hebrew Bible failed to recognise Jesus, as the
fulfillment, who miserably died on the cross as a sinner.

Unlike us, who are living in the New Testament age and who
can look at history from a different perspective, the Old Testament
prophets failed to see the long gap of time (the church age, when
the gospel is preached to the Gentiles) between the first coming of
Christ (His birth) and the second coming. This was probably why the
Jews were given the impression that there would be only one coming
rather than two separate comings. As a result, the Jews did not
recognise the first coming of Christ and are still waiting for their
Saviour to be born as a victorious king to rule this world.
This might be easy to understand for those who have
experienced the difficulty of judging the positions of two mountains
in the distance through a telescope. The mountains might lie side by side or there may be a big distance between them.

This is the reason for the separation of Christianity which
believes that this Jesus the Nazarene who died on the cross is the
Saviour of mankind, and Judaism which still await the coming of the

Jn.1:11
Jn.1:1
Mt.21:43,28:19, Mk.16:15, Ac.1:8

Saviour who will reign as a victorious king.
God's Spirit (The Holy Spirit) who is expressed as 'breath'
by the author of the Psalms;

By the word of the Lord were the heavens made,
their starry host
by the breath of his mouth,

was engaged in creation work with the Word of God (Jesus).
He was always with Jesus in the times of Jesus' birth, baptism,
temptation in the wilderness, sacrificial death, resurrection and so on.
Jesus' amazing ministry and deeds were all the result of the Spirit's
guidance.
The apostle, Luke has recorded in both the Gospel of Luke and the book of Acts in the New Testament, what is taking place and
also what will take place during the transitional time between Jesus'
earthly life time when He physically lived with men for a while and the time of his spiritual existence to His second coming. In other
words, in the book of Acts, it is written that even after His
resurrection and ascension, Jesus is consecutively doing
　

　all that He (Jesus) began to do and to teach

through the Holy Spirit.

Ps.33:6
Ge.1:1
Mt.1:18, Lk.1:35
Lk.3:21-22
Lk.4:1
Heb.9:14
Ro.8:11
Ac.1:1
Mk.8:31, Lk.24:26, Jn.16:7

The only way for Jesus' followers to receive God's grace was
For Jesus to undergo sufferings, be crucified as a sinner, be
resurrected and ascend. In the other words, the Father's promise,
the Holy Spirit(omnipresent Jesus' Spirit) has become available to
dwell in all those who believe in Jesus by being sent in stead of
Jesus.
'The Holy Spirit', whom Jesus mentioned as

you will receive power
when the Holy Spirit comes on you,
was given to all believers on the day of Pentecost.

Both events of Jesus' ascension and Pentecost have brought a
new age, which is the age of the gospel for Gentiles, or the age of
church growth. The work of the preaching of the gospel has spread
all over the world by the power of the Holy Spirit. Wherever the
gospel was taken and wherever believers came together, churches (i.e.,
God's temple) have been built beyond geographical restriction of
Jerusalem. The Holy Spirit, also called the Spirit of Truth, is a
helper, who convicts people of their sins and who leads them to the truth. Without His help, we would not be able to understand God,
Christ or the Bible.

Jn.14:16-20, Ro.8:9-11
Ac.1:8
Ac.2:1-39
Mk.16:15, Lk.24:47, Jn.4:20-24,14:12,
Jn.14;26,15:26,16:7-8,:13-15, Ro.8:14-16,:26-27, 2Co.3:16-18