Here is a participatory exercise.
JI Packer has a new book coming out in February. It is called 18 Words: The Most Important Words You Will Ever Know.
Just for fun: BEFORE you check out which 18 words Packer thinks are the most important, which words do you think are most important? Think of a list of 5 or 10 of the most important words, record them in the comments, and then see how many match Packer's list.
Then, feel free to comment on Packer's list. What has he left out?