Brethren, for a boy or a man to receive priesthood authority but neglect to do what is necessary to qualify for priesthood power is unacceptable to the Lord.

Brethren, for a boy or a man to receive priesthood authority but neglect to do what is necessary to qualify for priesthood power is unacceptable to the Lord. Priesthood holders young and old need both authority and power—the necessary permission and the spiritual capacity to represent God in the work of salvation.
April 2012 General Conference -  The Powers Of Heaven   -  Elder David A. Bednar