Basil the Great
Where are those who dishonor the Spirit? Where are those who attempt to separate Him from the life-giving force? Where are those who sever His connection with the Father and the Son? Let them listen to the psalm that declares, ‘By the word of the Lord the heavens are established, and by the Spirit of His mouth all their strength.’ Here, the "word" refers not to simple language formed from names and verbs, nor does "spirit" denote mere breath released into the atmosphere, but rather the Word, which ‘in the beginning was with God’ (John 1:1), and the Holy Spirit, in His true essence.
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Thus, just as the divine Word established the heavens, so too does the Spirit, who is from God and proceeds from the Father (which indicates that one should see Him not as separate or created, but as glorified, having His essence from God), collaboratively create all the powers that exist in Him. Therefore, it is through the Spirit that all heavenly powers find affirmation; the Spirit provides them with tension, strength, certainty of holiness, and all the virtues inherent to the sacred powers. Hence it is written, ‘The Spirit of His mouth,’ and in other passages, we read, ‘The Word of His mouth’ (cf. Is. 11:4), conveying that the Savior and His Holy Spirit both emerge from the Father. Since the Word of the Lord embodies the Savior and the Spirit of His mouth embodies the Holy Spirit, both played a role in creating the heavens and the heavenly powers, it is proclaimed, ‘By the Word of the Lord the heavens were established, and by the Spirit of His mouth all their power.’ Every sanctification occurs solely through the presence of the Spirit. Consequently, angels were brought into existence through the creating Word, the Creator of all, while sanctity was imparted to them by the Holy Spirit, for angels were not created as infants who would later become worthy of receiving the Spirit through gradual refinement. Instead, holiness was integrated into their very nature from the beginning. This is why they are not inclined to sin, as they are immediately enveloped in sanctification and, through the gift of the Holy Spirit, possess steadfastness in virtue.