“The advance of regret can be so gradual that it is impossible to say "yesterday I was happy, today I am not.”
Source: Where Angels Fear to Tread
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E.M. Forster 200
English novelist 1879–1970Related quotes

“Yesterday I was clever, so I wanted to change the World. Today I am wise, so I am changing myself.”
https://twitter.com/wise_chimp/status/1488946174321205253?s=21
“I am in yesterday, today. And tomorrow? In tomorrow I was.”
Estoy en el ayer, en el hoy. ¿Y en mañana? En el mañana estuve.
Voces (1943)

“I am who I am today because of the choices I made yesterday.”
Not by Roosevelt, but from Steven Covey's Seven Habits of Highly Effective People (1989).
Misattributed

Source: The Essential Groucho: Writings For By And About Groucho Marx

“I am not afraid of tomorrow
for I have seen yesterday
and I love today”

“Never regret yesterday. Life is in you today, and you make your tomorrow.”
The Creation Of Human Ability (1954).

Trauma
Lyrics, Loveppears

“For the yesterdays and todays, and the tomorrows I can hardly wait for - Thank you.”
Source: The Book of Tomorrow