In expounding the provision of assurance for believers, the apostle John also reminds his readers in his first epistle of some of the benefits that come from believing in Christ:

• fellowship with God (1:3, 6, 7)
• Jesus Christ as his advocate (2:1)
• the command (and an ability) to love others (2:7; 4:21)
• the anointing of the Holy Spirit (2:20, 27)
• relationship with both the Father and the Son (2:22-23)
• confidence before God (2:28; 3:21; 4:17, 5:14)
• the hope of eternity (3:3)
• God’s love (4:16)
• acceptance of God’s testimony about himself (5:10)
• eternal life (5:12, 13)
• answers to requests made in prayer (5:15)

These (and more) are all for the believer in Christ.  This is what we have when we have Christ and the Father.