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 16:13ekeino (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.