I suspect you’ve heard the oft-repeated and solemn warning: “We better not think that we must add our works to what Jesus did on the cross.” Doing so is portrayed as the most tragic error anyone could make, a sure indication that one is not a true Christian. In reality, however, that warning is a sloppy and confusing caution that can either be true or heretical, depending on what it is actually meant to convey.
If what is meant is, “We better not think that our works atone for our sins, as that would demean the sufficiency of Jesus’ atoning sacrifice on the cross,” it is true.