A Catholic encyclopedia defines justification as,
It goes on to say how justification is obtained:
Terminology varies but this is the essence of what many non-Catholics here believe...that one cannot be justified by God without works (usually camouflaged by calling it
obedience) because justification is not an act of God alone based on the work of Christ alone, but a PROCESS in which a person must cooperate with Christ by works, or at least "bear the fruit" of participating (which still amounts to works), or be lost.
The Calvinistic doctrine of Lordship Salvation, which has spread far beyond the boundaries of Reformed churches, is a distilled and highly refined version of this doctrine but it teaches basically the same thing: if a believer is not bringing forth the "fruit" of authenticating works, his salvation is dubious if not impossible.
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God's Truth is one professing non-Catholic with basically the same belief as taught by Rome but by no means is the only one. Most on TOL hold to some form of it. MADs are almost the only ones who repudiate any such belief.