It is your spirit that is instantly changed at salvation. It is perfect (Heb. ). It cannot sin (1 Jn. 3:9). Everything that is true of Jesus is true of our born-again spirit. Your spiritual salvation is complete. At salvation, you receive the same spirit that you will have throughout all eternity. It will not have to be changed or cleansed again. It is sealed with the Holy Spirit (Eph. ) and therefore, is sanctified and perfected forever (Heb. , 14; ).
For the remainder of our Christian life, we must not try to obtain faith, joy or love from God, but rather release what we already have in our spirits (Gal. 5:22-23) into our soul and body. Failure to understand this has caused some people to despair when they don't see sufficient change in their life after coming to the Lord for salvation. It must be understood that the change is internal in our spirit and the outward change will take place as we renew our minds through God's Word.