The LORD says:

Discernment helps people to see with more than
their eyes, they see with their hearts.  Those with
discernment have godly wisdom and understanding.
They stand on truth and My Holy Spirit impresses
upon their hearts what is happening around them
in the unseen realm.  There is a spiritual battle
raging.  I give discernment to those who use
it wisely.

Proverbs 3:21:
"My son, preserve sound judgment and discernment,
do not let them out of your sight;"