Charles de Montesquieu's quote suggests that peace is an outcome of trade. He suggests that when nations participate in trade, it produces a shared advantage that causes peace. Trade enables nations to exchange products and services, which can help to build relationships and foster understanding between them. This understanding can lead to a more peaceful relationship between nations. Furthermore, trade can help to reduce tensions between nations by providing an economic incentive for them to cooperate. By engaging in trade, nations can gain from each other's resources and develop a more tranquil environment. Ultimately, Charles de Montesquieu's quote suggests that peace is a natural consequence of trade, which countries need to strive to take part in trade in order to develop a more tranquil world.