The Spirit himself (
auto to pneuma). The grammatical gender of
pneuma is neuter as here, but the Greek used also the natural gender as we do exclusively as in
John 16:13 ekeino (masculine
he),
to pneuma (neuter). See also
John 16:26 (
o--ekeino). It is a grave mistake to use the neuter "it" or "itself" when referring to the Holy Spirit.
Beareth witness with our spirit (
summarturei twi pneumati hmwn).
See on "Ro 2:15"
for this verb with associative instrumental case. See
1 John 5:10 for this double witness.