Exactly today I talked with a friend about this

Future: The outcome is not fixed; the result that manifests depends on the aggregation of causes and conditions, and the most important of these causes and conditions are our personal will and actions. So how you act in the present moment directly influences the future.
Past: This is relatively easy to understand. People of different ages and levels of understanding will have different, even opposite, perspectives when looking back at past events.
Now: When the mind changes, everything changes accordingly. The present moment is eternity.
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GN