4 Bible Verses about Discernment, Source Of

And we received, not the spirit of the world, but the Spirit Who is of God; that we may know the things freely given us by God. Which things also we speak, not in words taught by human wisdom, but in those taught by the Spirit; combining spiritual things with spiritual. But a natural man receives not the things of the Spirit of God; for they are foolishness to him; and he cannot know them, because they are spiritually judged.read more.
But he that is spiritual judges all things; but he himself is judged by no one.

but solid food is for full-grown men, who by practice have their senses trained for the discernment both of good and evil.

and he not conformed to this age, but be transformed by the renewing of your mind, that ye may prove what is the good and well-pleasing and perfect will of God.

For who knew the mind of the Lord, that he should instruct Him? But we have the mind of Christ.