It contains 366 quotes, one for every day. I usually read it in the morning, then I take a photo on my phone and I re-read it during lunch time. This way I can process it again and make sure I (try to) 'fix' one thing at a time.
I have made this part of my "What the Most Successful People Do Before Breakfast" and "The Miracle Morning" combined-routine.
Also Mark Aurelius Meditations are interesting read. https://en.wikipedia.org/wiki/Meditations