President Thomas S. Monson taught us about the importance of retaining our worthiness,

“Let us have ready hands, clean hands, and willing hands, that we may participate in providing what our Heavenly Father would have others receive from Him. If we are not worthy, it is possible to lose the power of the priesthood; and if we lose it, we have lost the essence of exaltation. Let us be worthy to serve.”

“Willing and Worthy to Serve,” April 2012 General Conference – Priesthood Session