Could be from anyone - a work colleague/parents/a friend/a partner/a health visitor/a stranger on the street. Mine came from a little old lady outside Sainsbury's who stopped to look at my baby son in his buggy when he was about 8 months old. I was tired and grouchy, and she said to me "the days are long but the years are short." I've never forgotten it.
What's the best piece of advice you've been given and who by?