"but let us cultivate our garden..."
See in text (Chapter XXX)
Some critics believe that these final lines illustrate how Voltaire's characters are finally taking control of their lives. Their garden has become a symbol of their destiny, which they're finally creating rather than allowing the world to decide for them. Their decision to work in the garden and stop philosophizing has allowed them to at last be content. In the end, Voltaire's message is that individuals should just live their lives rather than spend all their time thinking about what it all means.