There's that inherent conflict in saying 'Rest in Peace' to a man who committed suicide. The knowledge that you say it with full awareness that peace was the last thing to ever hit his mind and the last thing that he ever found on Earth and can only find it in rest. The fact that by its very definition no one can ever empathize with him, and whatever sympathy present is more pity than understanding of the pain experienced.
I only wish what you can find peace where you've moved on to.
