In Jesus' final discourses to his disciples he identifies five different tasks of this Comforter. In each case we see that the work of the Holy Spirit is an extension of the work of our Lord, Jesus Christ. Now, a second comforter comes in the person of the Holy Spirit. The first work of the Holy Spirit that is described as the permanent indwelling of the Holy Spirit in the lives of believers is truth-teller. We are lost if we don't know what life is all about.
Nothing makes sense.
Life, without the truth about life, is senseless. We see it every day. The God who made us came to save us because he loves us. The heart has its reasons which reason does not know. This life is not the only life and this world is not the only world.