“And these things write we unto you, that your joy may be full.”
King James Version (KJV)
1:4 That your joy may be full - So our Lord also, #John 15:11|; #16:22|. There is a joy of hope, a joy of faith, and a joy of love. Here the joy of faith is directly intended. It is a concise expression. Your joy - That is, your faith and the joy arising from it: but it likewise implies the joy of hope and love.
1Jo 1:4 These things write we unto you. This assurance of the divine fellowship is given in order that your joy may be full. They may rejoice with the fullness of joy in the glorious hope.