'Essential' in the Bible
They show that the essential requirements of the Law are written in their hearts; and their conscience [their sense of right and wrong, their moral choices] bearing witness and their thoughts alternately accusing or perhaps defending them
and know His will and approve the things that are essential, being instructed out of the Law,
an educator of the senseless, a teacher of little children, because you have in the law the essential features of knowledge and of the truth --