The Lord Jesus explained why He needed to leave (John 16:1-4) so the Holy Spirit could be sent, who would guide them into all truth. Moreover, the Holy Spirit, would convict the world of sin, righteousness, and judgment. The Spirit of God would also glorify Christ (John 16:5-15). Without fully revealing the specifics, Jesus spoke of His coming departure and return, alluding to His death and resurrection. He assured the disciples that their sorrow would be temporary and would soon turn into great joy. This joy, unlike their sorrow, would be lasting and profound.