The informant is my mother who is Irish and she grew up in Buffalo, New York. She always used to tell me this proverb growing up and still says this to me today.
“Your tomorrow self will thank your today self.”
I have never heard this proverb before and she is really the only person I have ever heard say it. My mother said her Irish grandmother would say it to her growing up. Upon further research I could not find where the proverb originated from, but I kept finding this:
“Do something today that your future self will thank you for.”
Which has the same sentiment and was apparently originally said by Sean Patrick Flanery who is also Irish.
If this is an Irish proverb, it tells me that the culture is very efficient and very in the now. I think American world view is very much future oriented and we put things off, but this proverb encourages people to do things now so you don’t have to think about it in the future.
For another version of this proverb see “Jane Two,” written by Sean Patrick Flanery.