Assuming that this is in the context of bible quotes, this seems to mean: "quoting biblical verse is good for your 'spirit' rather than being useful or relevant to the physical world. If you believe that your life vests from a 'spirit' they are good."
or, in terms of popular culture:
"listen to me and you will learn the ways of the Force (but not in a way that's actually demonstrable in the physical world like real Jedi)."
