God promises and prophecise through Isaiah that he will put his 7 Spirit (Spirit of the Lord, spirit of wisdom and understanding, spirit of council and might, spirit of knowledge and fear of the Lord) on the messiah, Jesus Christ.
This was fulfilled in the New Testament when the 7 Spirits of God was manifested and revealed through the life of our Lord and Saviour Jesus Christ.
I would like to go back further and interestingly note that the holy spirit in Genesis 1...."And the Spirit of God was hovering over the face of the waters," is the same spirit that prophesied through Isaiah and revealed himself in the New Testament through the life of our Lord and Saviour Jesus Christ.
The holy spirit is the link and the operating agent between the old Testament and new Testament allowing God's will to be done on earth as it is in heaven.