Like the earth, we are unable to produce any good unless we have first been sown with religious insights, which enable us to see what to believe and do. The role of the intellect is to hear the Word, while the role of the will is to do it.
To hear the Word and not act is to claim we believe it, although we do not live by it. People who act like this separate the two and split their minds.
The Lord says they are foolish:
“Everyone who hears my words and does them I compare to a prudent person, who built his house on rock. But everyone who hears my words and does not do them I compare to a stupid man who built his house on sand.” (Matthew 7:24, 26)