In The Words of My Perfect Teacher, the discussion on precious human birth, impermanence, etc. is followed immediately by an elaboration on the merit and the benefits of liberation. Why is it necessary to talk about the benefits of liberation? When we do not understand the benefits of liberation, we lose hope because we think there is no purpose in life if everything is impermanent; when we understand the benefits and know liberation represents eternal happiness, rather than being pessimistic, we feel optimistic and happy. Because we finally see the reason for living and will then direct all our effort at attaining liberation. At that point, true renunciation can be cultivated. The ultimate goal of practicing impermanence is none other than realizing this outcome.
~Depicted from THE FOUR SEALS OF DHARMA - The Practice of Impermanence