What is the scriptural basis for believing that God wants us to know an action is morally, objectively right or wrong? As a Catholic I believe that God wants us to know with certainty if any given action is morally, objectively right or wrong and that He reveals this to us in various ways.

I would like to know what scriptural evidence supports this concept.  Answers should not be concerned with mitigating factors specific to an individual's circumstances.  Only with whether God desires for us to know what is objectively right and wrong with certainty.
I got these two verses that I hope help you out:

James 4:17 ESV So whoever knows the right thing to do and fails to do it, for him it is sin.
Isaiah 5:20 ESV Woe to those who call evil good and good evil, who put darkness for  light and light for darkness, who put bitter for sweet and sweet for bitter!