Animals in the wild flee the dangers they see and are tranquil once they have escaped; we, though, are tormented both by what is to come and what has been. Often, our goods do us harm: memory recalls the stab of fear; foresight anticipates it. No one is made wretched merely by the present.

Seneca (4 BC – AD 65),  Moral Letters to Lucilius (5.9)

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