A man could have all the money in all the banks in all the world, and be worth nothing so far as God is concerned, if he were still living "to and for himself"!
Christ in you, on the grounds of redemption this is the Gospel! To preach anything less than this must inevitably produce "Evan-jellyfish" folk with no spiritual vertebrae, whose faith does not "behave!"
The flesh everything that you do apart from Him "profiteth nothing" (John 6:63), and there is always the awful possibility, if you do not discover this principle, that you may spend a lifetime in the service of Jesus Christ doing nothing!
The moment you are redeemed through the atoning death of Christ upon the cross, you receive the Holy Spirit within your human spirit.