here at A Major Shift, by JenHeadJen. The post is about the importance of service to our fellow men and a theory as to why service feels so rewarding. Most importantly, it's pretty short! So if you have a minute, give it read.
If you have more than a minute, then read some of the other posts she's got up. The blog contains many insights that come from scripture study and other spiritual pondering. If you're LDS, give it a look for a quick spiritual boost. If you're not LDS, give it a look to get a glimpse into the LDS perspective.