 Hume divides the virtues into two types: artificial and natural. Artificial virtues include justice, promise-keeping, and allegiance to legitimate government. Natural virtues include courage, magnanimity, ambition, friendship, generosity, fidelity, and gratitude, among many others. Whereas each exercise of the natural virtues normally produces good results, the good of artificial virtues is indirect in that it comes about only as a result of there being an accepted practice of exercising these virtues.