4 Bible Verses about Discernment, Source Of

And as for us, it is not the Spirit of the World that we have received, but the Spirit that comes from God, that we may realize the blessings given to us by him. And we speak of these gifts, not in language taught by human philosophy, but in language taught by the Spirit, explaining spiritual things in spiritual words. The merely intellectual man rejects the teaching of the Spirit of God; for to him it is mere folly; he cannot grasp it, because it is to be understood only by spiritual insight.read more.
But the man with spiritual insight is able to understand everything, although he himself is understood by no one.

But 'solid food' is for Christians of mature faith--those whose faculties have been trained by practice to distinguish right from wrong.

Do not conform to the fashion of this world; but be transformed by the complete change that has come over your minds, so that you may discern what God's will is--all that is good, acceptable, and perfect.

For 'who has so comprehended the mind of the Lord as to be able to instruct him?' We, however, have the very mind of Christ.