John Calvin on the Divinity of the Holy Spirit

"The best proof to us [of the divinity of the Spirit] is our familiar experience.  For nothing can be more alien from a creature, than the office which the Scriptures ascribe to him, and which the pious actually feel him discharging - his being diffused over all space, sustaining, invigorating, and quickening all things, both in heaven and on the earth.  The mere fact of his not being [defined] by any limits raises him above the rank of creatures, while his transfusing vigor into all things, breathing into them being, life, and motion, is plainly divine.  Again, if regeneration to incorruptible life is higher, and much more excellent than any present quickening, what must be thought of him by whose energy it is produced?  Now, many passages of Scripture show that he is the author of regeneration, not by a borrowed, but by an intrinsic energy; and not only so, but that he is also the author of future immortality.  In short, all the peculiar attributes of the Godhead are ascribed to him in the same way as to the Son.  He searches the deep things of God, and has no counselor among the creatures; he bestows wisdom and the faculty of speech, though God declares to Moses (Exod 4:11) that this is his own peculiar province.  In like manner, by means of him we become partakers of the divining nature, so as in a manner to feel his quickening energy within us.  Our justification is his work; from him is power, sanctification, truth, grace, and every good thought, since it is from the Spirit alone that all good gifts proceed.  Particular attention is due to Paul's expression that though there are diversities of gifts, 'all these [are empowered by] one and the self-same Spirit' (1 Cor 12:11), he being not only the beginning or origin, but also the author; as is even more clearly expressed immediately after in these words 'dividing to every man severally as he will.'  For were he not something subsisting in God, will and arbitrary disposal would never be ascribed to him.  Most clearly, therefore, does Paul ascribe divine power to the Spirit, and demonstrate that he dwells [fundamentally] in God" (John Calvin, Institutes of the Christian Religion, 1.13.14).