A Lesson Learned

Sitting at lunch today, someone uttered the phrase, "Mark my words." We then began discussing its origins - assuming it had something to do with an act of making notations, perhaps with a writing utensil, on an actual written phrase (i.e. on a piece of paper). We were close. Apparently, "mark" in this case means to write, hence "mark my words" means to write down an individuals words. This enables the written words to be referenced later on - proving the speaker correct.