The first Dharma Seal is impermanence.
Nothing remains the same for two consecutive moments.
Heraclitus said we can never bathe twice in the same river. The Buddha implored us not just to talk about impermanence, but to use it as an instrument to help us penetrate deeply into reality and obtain liberating insight. We may be tempted to say that because things are impermanent, there is suffering. But the Buddha encouraged us to look again. Without impermanence, life is not possible.