Seneca saw how people tortured themselves with what-ifs. He called it 'self-inflicted suffering' — worrying about things that might never come. He once wrote to Lucilius: 'We suffer more in imagination than in reality.' Stoicism teaches that the present moment is rarely unbearable. It is the weight of tomorrow — endlessly rehearsed and feared — that crushes us. Cut that weight, and you find calm.