Having been born again of the Spirit in our spirit (John 3:6, 8 – see the prior post), we are in the condition described in Romans 8:16, “The Spirit Himself witnesses with our spirit that we are children of God.” When we receive Jesus, He makes us children of God, born of God (John 1:12). This is the fact. Outwardly we have the Bible confirming this fact to us. Inwardly the Spirit witnesses with our spirit to confirm this fact. It is not that our spirit and the Spirit each witness separately but that they witness together as one. This is 1 Corinthians 6:17, “But he who is joined to the Lord is one spirit.”
There are many verses in the epistles that include the word “spirit.” In some of these verses the word clearly refers to our human spirit and in some it clearly refers to the Holy Spirit. An example is Romans 8:16, quoted above. However, in other verses we cannot say clearly that the reference is to the divine spirit or to our human spirit. This is because the Spirit is one with our spirit. Romans 8:4 is such a verse saying, “walk according to the spirit.” Our walk is not solely in our human spirit nor solely in the divine Spirit. Instead, we walk according to the Spirit who is one with our spirit. This is the case in Revelation 21:10: to be “carried away in spirit” to see New Jerusalem is to be carried away in the Spirit mingled with our human spirit.
(English New Testaments almost always use capital S for the divine Spirit and small s for our human spirit. Which to use in is the translators’ decision because when the New Testament was written, and for at least seven centuries afterwards, Greek writing was all capitals.)