Avoiding Two Fatal Errors

The possibility of opposite (and competing) ERRORS is not a modern problem; it has ALWAYS been a problem.  During Apostolic era, two prominent errors were:
#1 -- The ADDITION of "works of law" in order to be saved (justified)
#2 -- The SUBTRACTION of "works of faith" as a necessary effect/outcome of salvation (justification).

Various Scriptures Include:

Acts 15:1-21 (The Jerusalem Council)
Galatians 2:15-16
Romans 3:19-24 ;  4:1-10

Romans 6:1-2, 15-16
Galatians 5:1-14