For the truth's sake, which dwelleth in us, and shall be with us for ever.
The TRUTH is referring to The Lord Jesus Christ.. HE is whom dwelleth within all believers and it is HE whom we we will be with for eternity because HE paid the sin debt penalty we owed and declared us righteous and justified us before GOD the Father HIMSELF by his own shed blood on that cross... Without the shedding of blood thereis no remission of sins! Thank GOD we have a Saviour who willingly gave HIMSELF that we could be with him eternally when we leave these temporary bodies....