'Weak Conscience' in the Bible

However, not every person knows this [truth]. For some people have been so used to an idol all this time that they still think of the idol [as a reality] when eating food that has been sacrificed to it. And their weak conscience becomes polluted. [Note: These people cannot seem to shake off the idea that somehow the idol is real, so feel guilty of wrongdoing when eating food sacrificed to it].

For if someone with a weak conscience sees you, who have [correct] knowledge [in this matter], eating in an idol's temple, will he not be encouraged to eat food sacrificed to idols?

And in this way, when you sin against the brothers by injuring their weak conscience, you are [actually] sinning against Christ.