It is within my power either to serve God or not to serve him. Serving him, I add to my own good and the good of the whole world. Not serving him I forfeit my own good and deprive the world of that good, which was in my power to create.

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Gender-neutral version:

It is within my power either to serve God or not to serve God. Serving God, I add to my own good and the good of the whole world. Not serving God I forfeit my own good and deprive the world of that good, which was in my power to create.