Telling Use of Language --- "I did" beats "I will" any day

I am a procrastinator. I don't know when or how I became one but I did and there's no denying it. Recently a friend of mine made a comment to me about my procrastination of a certain much needed task. I told him, "I will, I will" to which he responded "'I did' beats 'I will' and day." I was somewhat taken back first of all because I had just been called out by my friend second because it was a genius phrase and very telling use of language. The words I did mean that somethings has already been done versus the words I will which mean that something has yet to be done. This phrase places the value in the goal having been accomplished rather than the intention to accomplish the goal.