I came across this in a book by Isaac Watts and thought it quite good. Apparently the Pythagoreans recommended this practice.
"Nor let soft slumber close your eyes,
Before you’ve recollected thrice
The train of action through the day:
Where have my feet chose out their way’
What have I learn’d, where’er I’ve been,
From all I’ve heard, from all I’ve seen?
What know I more that’s worth the knowing?
What have I done that’s worth the doing?
What have I sought that I should shun?
What duty have I left undone?
Or into what new follies run?
These self-inquiries are the road
That leads to virtue, and to God. "
