There's a quote widely attributed to Laozi, author of the Tao Te Ching
If you are depressed you are living in the past. If you are anxious you are living in the future. If you are at peace you are living in the present.
https://books.google.com/books?id=7QNk4eNvS44C&pg=PA175&lpg=...
There's a quote widely attributed to Laozi, author of the Tao Te Ching