I just ran across this in my A.Word.A.Day with Anu Garg email. It was an old one from January 11, but how approriate that I read it today. It's the introduction to the week's theme of words related to religion.
"The word religion derives from Latin ligare (to tie or to bind, as in 'ligament')..."
If you enjoy words like I do, you might want to sign up for a word a day at Wordsmith.org