To suppose now that this Holy Ghost is not a divine person is for men to dream whilst they seem to be awake. I suppose by all these testimonies we have fully confirmed what was designed to be proven by them,namely, that the Holy Spirit is not a quality, as some speak, residing in the divine nature; not a mere emanation of virtue and power from God; not the acting of the power of God in and unto our sanctification; but a holy intelligent subsistent or person. And in [Scripture] many instances have been given, whence it is undeniably evident that He is a divine, self-sufficient, self-subsisting person, together with the Father and the Son equally participant of the divine nature.
John Owen