While physical and mental health are widely recognized dimensions of human well-being, this article introduces philosophical health as a crucial third dimension that addresses our fundamental orientation in life and our deeper sense of purpose. As we face unprecedented global challenges, from environmental and political crises to technological disruption, philosophical health offers practical wisdom for creating what Leibniz called ‘the best of all possible worlds’: one where individual fulfilment and collective flourishing become complementary, offering ‘compossible’ rather than competing goals. The article concludes by suggesting how philosophical health can be cultivated through regular practice, suggesting that this development is essential for addressing our most pressing contemporary challenges.