Look to this day,
For it is life,
The very life of life.
In its brief course lie all the truths
And realities of your existence;
The bliss of growth
The glory of action, and
The splendor of beauty;
For yesterday is but a dream
And tomorrow is only a vision,
But today well lived makes
Every yesterday a dream of happiness
And every tomorrow a vision of hope.
Look well, therefore, to this day.
Such is the salvation of the dawn.

- A selection from The Bhagavad-Gita.
Also attributed to the Indian poet Kalidasa.