The advance of regret can be so gradual that it is impossible to say "yesterday I was happy, today I am not."
This is a quote from E.M. Forster's Where Angels Fear to Tread, which I am reading for my book club next week.
I can honestly say I have no obvious regrets in my life. Sure, a few things I might have done differently on a daily level, like been nicer to a disobedient boy. Avoided a bit of road rage. Or not eaten the second brownie.
But my life has been good. I recognize my many blessings. Yesterday I was happy, today I am too.