Zechariah 3:9, Revelation 1:4, 3:1, 4:5, & 5:6 AMP

The first thing that we must understand is that there are NOT seven spirits of God, or seven Holy Spirits.
"For by ONE Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into ONE Spirit." 1 Corinthians 12:13.
There is only ONE Holy Spirit, which is the Spirit of God. But there are seven different facets or characteristics of the Holy Spirit of God that we ALL, as Holy Spirit filled believers, must allow to become our ‘new nature’.

In Isaiah 11:2, it foretells the sevenfold Holy Spirit:
"The Spirit of the Lord" = Yah•weh - the proper name of the God of Israel.
"The Spirit of wisdom"
"Spirit of counsel"
"Strength" = courage, mighty deeds
"The Spirit of knowledge" = truth
"Fear of the Lord" = awesome reverence for the God of Israel.

The NT speaks of seven different 'Spirits' or characteristics of the Holy Spirit (pneuma hagion):

"Spirit of Christ" = the anointing, the power of God, the Sonship Spirit, knowing that we are INDEED heirs of God and joint heirs with Jesus Christ. (1 Peter 1:11, Romans 8:9)

"Spirit of wisdom" (Ephesians 1:17, also Deuteronomy 34:9, Exodus 28:3)

"Spirit of grace" = favor, disposed to, inclined, favorable towards, leaning towards to share benefit, freely extended to give Himself away to people because He is "always leaning toward them" (Hebrews 10:29, also Zechariah 12:10)

"Spirit of truth" = truth, but not merely truth as spoken; truth of idea, reality, sincerity, truth in the moral sphere, divine truth revealed to man, straightforwardness, was synonymous for "reality" as the opposite of illusion. (John 15:26, 16:13 & 15, 14:17, 1 John 4:6)

"Spirit of faith" = pistis - faith, belief, trust, confidence; fidelity, faithfulness. Faith is always a gift from God, and never something that can be produced by people. In short, 4102/pistis ("faith") for the believer is "God's divine persuasion" – and therefore distinct from human belief (confidence), yet involving it. The Lord continuously births faith in the yielded believer so they can know what He prefers, i.e. the persuasion of His will (1 Jn 5:4). [4102 (pistis) in secular antiquity referred to a guarantee (warranty). In Scripture, faith is God's warranty, certifying that the revelation He inbirthed will come to pass (His way). Faith (4102/pistis) is also used collectively – of all the times God has revealed (given the persuasion of) His will, which includes the full revelation of Scripture (Jude 3). Indeed, God the Lord guarantees that all of this revelation will come to pass! Compare Mt 5:18 with 2 Tim 3:16.] The root of 4102/pistis ("faith") is 3982/peithô ("to persuade, be persuaded") which supplies the core-meaning of faith ("divine persuasion"). It is God's warranty that guarantees the fulfillment of the revelation He births within the receptive believer (cf. 1 Jn 5:4 with Heb 11:1). Faith (4102/pistis) is always received from God, and never generated by us. (2 Corinthians 4:13)

"Spirit of life" = zōḗ – life (physical and spiritual). The Lord intimately shares His gift of life with His people, creating each in His image which gives all the capacity to know His eternal life. (Romans 8:2, Revelation 11:11)

"Spirit of gentleness, or meekness" = ("gentle strength") which expresses power with reserve and gentleness. See 4236 (praotes). For the believer, meekness (4240 /praýtēs, "gentle-force") begins with the Lord's inspiration and finishes by His direction and empowerment. It is a divinely-balanced virtue that can only operate through faith. (1 Corinthians 4:21, Galatians 6:1)

The scriptures also quite often refer to the Holy Spirit (or the different operations or characteristics of the Holy Spirit) as ‘The Spirit of the Lord’ or ‘The Spirit of God’

2 Corinthians 3:17, “Now the Lord is that Spirit: and where the Spirit of the Lord is, there is liberty.”

Lord = kurios - properly, a person exercising absolute ownership rights; lord, master
Romans 8:14, “For as many as are led by the Spirit of God, they are the sons of God.”

God = theos - properly, God, the Creator and owner of all things
It is imperative to go back to the original Greek in order to understand which ‘operation’ or ‘characteristic’ it is referring to. However, both refer to the ‘New Nature’.

Also read: “The Divine Names and Titles in the New Testament” Appendix 98, and “The Usage of Pneuma in the New Testament” Appendix 101 from ‘The Bullinger Companion Bible’.