Die fröhliche Wissenschaft, 1882. Recommended translations: The Gay Science, with a Prelude in Rhymes and an Appendix of Songs, trans. Walter Kaufmann, Random House, 1974. The Gay Science (The Joyful Wisdom), trans. Thomas Common, Macmillan Co., 1924.

Excerpt:

1. Invitation

Take a chance and try my fare:
It will grow on you, I swear;
Soon it will taste good to you.
If by then you should want more,
All the things I’ve done before
Will inspire things quite new.

2. My Happiness

Since I grew tired of the chase
And search, I learned to find;
And since the wind blows in my face,
I sail with every wind.

Online:
Amazon (Recommended Translation)
Nietzsche Source (German, Free Access)

Archive.org (Recommended Translation, Free Access)