1 John 1:3,4

That which we have seen Him, I say, of whom we have such infallible knowledge, or that which we have seen and heard from him and of him; declare we to you For this end; that ye also may have fellowship with us May enjoy the same fellowship which we enjoy; or, in other words, that, being fully satisfied and firmly persuaded of the truth of our testimony, and laying hold on him by a lively faith, you may have fellowship with God and with Christ, such as we apostles, and other faithful Christians have, and may partake with us of the benefits and privileges we enjoy thereby. And truly our fellowship Whereby he is in us, and we in him; is with the Father We are savingly acquainted with, have access to, and intercourse with, the Father, and partake of all those blessings which God the Father has promised to those that are in covenant with him; and with his Son Jesus Christ And we partake also of all those privileges Christ has purchased for his members, namely, pardon, reconciliation, the divine favour, adoption into God's family, the Spirit of adoption sent into our hearts, regeneration, sanctification, a lively, joyful hope of the heavenly inheritance, and an earnest of that inheritance by his Spirit dwelling in us, whereby we sit in heavenly places with Christ Jesus. And these things write we unto you We not only declare them in word, which might soon escape from your remembrance, but we put them down in writing, that you may frequently peruse and consider them; that your joy may be full So our Lord also, John 15:11; John 16:22; that is, to confirm you in the faith, and direct you into that way, wherein you may have an abundant source of comfort. There is a joy of faith, a joy of hope, and a joy of love. Here the joy of faith is chiefly intended: and the expression, your joy, chiefly means your faith, and the joy arising from it. It likewise, however, implies the joy of hope, and the joy of love.