'Vital' in the Bible

and [if you claim to] know His will and approve the things that are essential or have a sense of what is excellent, based on your instruction from the Law,

And, without growing weak in faith, he could contemplate his own vital powers which had now decayed--for he was nearly 100 years old--and Sarah's barrenness.

For I testify about them that they have a certain enthusiasm for God, but not in accordance with [correct and vital] knowledge [about Him and His purposes].