1 John 1 4
We are writing these things to you so that our joy [in seeing you included] may be made complete [by having you share in the joy of salvation].God Is Light
Compare with other 3 random translations
ASV 1 John 1:4and these things we write, that our joy may be made full.
EAS 1 John 1:4We are writing to you so that together we all may be completely happy.
FBV 1 John 1:4We're writing to tell you about this in order to make our happiness complete.