One main theme in the book of James is that knowing and doing are two separate acts. It’s important to know the right thing to do, but if you never do it you “miss the mark” (James 4:17). That’s what sin is – missing the intended target of righteous living. Simply put, knowledge of the right thing to do without doing it is worthless, vain, and empty. As Jesus said to the lawyer who answered His question rightly, “Go and do” (Luke 10:37). To never “do” is to prove that you never believed the truth enough to actually do it.
“For just as the body without the spirit is dead, so also faith without works is dead.” (James 2:26)