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.
Quote by Lao Tzu
Lao Tzu, also known as Laozi and Lao-Tze, was an ancient Chinese philosopher and writer. He is the reputed author of the Tao Te Ching, the founder of philosophical Taoism, and a deity in religious Taoism and traditional Chinese religions. (source: Wikipedia)