Pneuma: from the spiritual condition of Christ to the Holy Spirit-agent

Was the identity of the Holy Spirit as a personal agent already obvious
in the expressions of faith at the pre-literary stage of Christianity?
This book traces the evolution of the expression of the early Christian
faith in relation to the notion of pneuma (spirit). It shows
that, first of all pneuma, as long as it can be traced from three
passages in antithesis with sarks (1 Tim 3:16; 1 Pet 3:18,22 and
Rom 1:3-4) reflecting the Christian theology prior to the early New
Testament writings, referred to the spiritual condition to which Christ
had access as a result of his resurrection, in contrast to his previous
earthly condition. Then in a more in-depth examination of Rom 1:4 from
the angle of identifiable redactions, it continues to show how the
passage/transition from this representation of the pneuma-condition to that of the pneuma (Spirit)
designating the Holy Spirit took place.