speak the truth or hold your peace. talk to someone else, keep practicing.
if you are not ready to speak the truth, or if the listener is not ready to hear the truth, stay silent and wait. prepare for the right moment, keep learning. you will know when the moment is right. for most people it takes a few points of contact with the truth before they begin to accept it.
if you are ready, do not hesitate, say what must be said. lies are like evil spells. every word that counters the lies counts in this fight. keep chipping away at the lies relentlessly, and we're going to win.