Here's the commentary I'm also reading: http://www.earlychristianwritings.co...lthomas27.html
Some of the comments in the link I provided suggested the part about the sabbath meant that every day should be viewed as the sabbath. This would go with the part about fasting from the world better as I see it. I also don't know what it means to fast from the world.
Merry Christmas and Happy New Year!