Joseph Grenny, author of Crucial Conversations, highlights in a Harvard Business Review article four ways to best prepare for a tough conversation. The third way is to "gather the facts."
Difficult conversations come with opposing views. You may have a history and feelings that shape your conclusions, while the other party has theirs.
In fairness to all, do your research and gather facts. Don’t build your arguments around assumptions or feelings. Too many people have been fired without having any idea what they did wrong, due to a lack of facts being presented.
Proverbs 14:5 teaches, “An honest witness does not deceive, but a false witness pours out lies.”
Gathering facts is the best way to overcome lies. Your tough conversations should be based on facts, not lies or emotions.