Doesn't the Christian have remaining sin to deal with? While, ultimately in Christ the Christian does not have guilt, the Christian still has to deal, daily and continually with the problem of remaining sin while still in this life so, in that sense, we do need to remind each other of what God requires. I know I do.

The Chestnut Mare
All that is gold does not glitter,
Not all those who wander are lost
The old that is strong does not wither,
Deep roots are not reached by frost.
- - - -JRR Tolkien "Lord of the Rings"