Seneca reveals the cruel irony of anxiety - in trying to protect ourselves from future suffering, we create present suffering. Worry doesn't prevent bad things from happening, but it does guarantee that we experience them twice: once in fearful anticipation and again (if at all) in reality. The anxious mind lives in a future that doesn't exist, missing the peace and opportunities available in the present moment. This insight doesn't dismiss legitimate planning and preparation but distinguishes between practical foresight and destructive worry. We can prepare for potential challenges without tormenting ourselves with endless 'what if' scenarios.