I started off with a list of affirmations gathered from a variety of inspirational quotes websites. In this case, I used mostly quotes having to do with women and achievement as that was the audience. But the quotes can be tailored to be as generic or specific as necessary. I added the affirmations to a table in Word, and printed them out on colored paper. Each column of the table of affirmations includes the same affirmations, so that I only used half a sheet of each colored paper per jar.
I left the gridlines on the table in Word for printing, so that I had a natural template to cut across. This is probably the most tedious process of the entire project - cut each affirmation into a strip, and then fold into a tiny square and fill each jar.
I used a label template to find a circle that would fit the top of each lid (just google mason jar lid template) and also printed labels for each jar. Cut and attach (the jars I used had a removable top that I affixed the label to - you could also use a hole punch and ribbon to tie the label around the jar instead).
Assemble and display - a quick and easy favor that the recipient is sure to love.