"Deep within their conscience human persons discover a law which they have not laid upon 
themselves but which they must obey. Its voice, ever calling them to love and to do what is 
good and avoid evil, tells them inwardly at the right moment: do this, shun that. For human 
persons have in their hearts a law inscribed by God... the more a correct conscience 
prevails, the more do persons and groups turn aside from blind choice and try to be guided 
by the objective standards of moral conduct. 

Yet it often happens that conscience goes astray through ignorance which it is unable to avoid, without thereby losing its dignity. This cannot be said of the person who takes little trouble to find out what is true and good, or when conscience is by degrees almost blinded through the habit of committing sin." (Vatican II, The Church in the Modern World)

Church doctrine consists of objective standards of moral conduct - God's laws which through real sloth, ignorance or sin, we overlook.