D&C 46

With all the other gifts of the Spirit, one of the gifts of the Spirit of God is -

"...the discerning of spirits." (Doctrine and Covenants Section 46:23)

suggesting a gift to discern the influences, gifts, and testimonies of others as given.

Speaking of the gift of discernment, Elder Stephen L Richards explained that this gift -

"...arises largely out of an acute sensitivity to impressions—spiritual impressions, if you will—to read under the surface as it were, to detect hidden evil, and more importantly to find the good that may be concealed. The highest type of discernment is that which perceives in others and uncovers for them their better natures, the good inherent within them. It’s the gift every missionary needs when he takes the gospel to the people of the world. He must make an appraisal of every personality whom he meets. He must be able to discern the hidden spark that may be lighted for truth. The gift of discernment will save him from mistakes and embarrassment, and it will never fail to inspire confidence in the one who is rightly appraised." (In Conference Report, Apr. 1950, p. 162.)

Those that generally need this special gift more than others are those in positions of leadership or those that preside. The Lord said -

"And unto the bishop of the church, and unto such as God shall appoint and ordain to watch over the church and to be elders unto the church, are to have it given unto them to discern all those gifts lest there shall be any among you professing and yet be not of God." (Doctrine and Covenants Section 46:27)

Elder Richards also explained -

"...the gift of discernment is essential to the leadership of the Church. I never ordain a bishop or set apart a president of a stake without invoking upon him this divine blessing, that he may read the lives and hearts of his people and call forth the best within them. The gift and power of discernment in this world of contention between the forces of good and the power of evil is essential equipment for every son and daughter of God." (In Conference Report, Apr. 1950, p. 163.)