2 John 1:2 For the truth’s sake, which dwelleth in us, and shall be with us forever.
The promise to us this: Truth will live in us and be with us forever. Jesus promises to send us the Spirit of Truth to dwell within our spirit and to be with us today and tomorrow and forever, even after we die from this world. When we believe in Jesus and confess Him as personal Savior and Lord we enter into the Kingdom of Truth, and Truth enters into us. This promise gives us great comfort, security, and strength for daily living in the present and a sure hope for the eternal future.
How do we know what we know? And how do we know that what we believe is true? We know because the Spirit of Truth, sent by the Person who is the Truth, convinces us of the truth through the Gospel. Truth says two things: that we are lost and condemned sinners deserving of death, and that Jesus died for us to forgive sins and give us righteousness and life. Indwelling Truth grants repentance and faith in the Gospel. This truth is alive in us today and forever.
As light pushes back darkness and life defeats death, so truth easily overcomes lies. And we hear lies all the time, so relentlessly that we begin to believe the Lie. The devil is a liar from the beginning and the father of lies and he ceaselessly prowls. The world is shouting lies at us all the time from all sides constantly. And our own sinful flesh within is deceitful above all things and ready to receive the lies from within and without. But Truth dwells within like a belt of truth and we hold up the Shield of Faith. Truth always wins and it is with us forever.