Listen to the Exhortation of the Dawn!

I came across this passage many years ago in one of my yoga books. I was very struck with it then and I still am:

Look to this Day!
For it is Life, the very Life of Life.
In its brief course lie all the
Verities and Realities of your Existence.
The Bliss of Growth,
The Glory of Action,
The Splendor of Beauty;
For Yesterday is but a Dream,
And To-morrow is only a Vision;
But To-day 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 Salutation of the Dawn!

-- Kalidasa