“Nearly every night before I go to bed I ask myself, "Have I vibrated in tune with the Infinite today, or have I failed?”

As quoted in "Quotable Cary" at American Masters (25 May 2005)
Source: https://www.newspapers.com/clip/33680672/the-los-angeles-times/ "Cary Grant: Doing What Comes naturally,"

Regarding moving so many times as a child
Attributed

As quoted in Sophia, Living and Loving: Her Own Story (1979) by A. E. Hotchner, p. 76.
Context: I was blessed with a sense of my own destiny. I have never sold myself short. I have never judged myself by other people’s standards. I have always expected a great deal of myself, and if I fail, I fail myself. So failure or reversal does not bring out resentment in me because I cannot blame others for any misfortune that befalls me.

As quoted in the article "Joshing Around" in Movieline magazine (November 1999)
Context: Four years ago, I was working steadily but I felt I was disappointing my family, my friends in not living up to what they expected of me. When The Skulls came along I was drawn to it because it's a morality tale encapsulated in a thriller about a guy caught in a Faustian bargain between doing the right thing and the siren song of 'Just let go of your morality and think of all you can have.' Being Irish, I come from a Celtic tradition of storytellers and this was a story I wanted to help tell. I can honestly say I've never worked harder. But to go to bed every night saying to yourself, 'Man, I'm exhausted, but I did a great day's work' it's the best feeling you can have in this planet.

Bed in Summer, st. 1.
A Child's Garden of Verses (1885)

Source: The Sweet Far Thing

Pt. I, ch. 5
Confession (1882)

2005-09, Address at Stanford University (2005)
Context: When I was 17, I read a quote that went something like: "If you live each day as if it was your last, someday you'll most certainly be right." It made an impression on me, and since then, for the past 33 years, I have looked in the mirror every morning and asked myself: "If today were the last day of my life, would I want to do what I am about to do today?" And whenever the answer has been "No" for too many days in a row, I know I need to change something.