“Love isn't an act, it's a whole life.”

Source: The Moon and Sixpence (1919), Ch. 21, p. 80

Source: Lamb: The Gospel According to Biff, Christ's Childhood Pal

Elegy 1
Roman Elegies (1789)
Context: I'm gazing at church and palace, ruin and column,
Like a serious man making sensible use of a journey,
But soon it will happen, and all will be one vast temple,
Love's temple, receiving its new initiate.
Though you're a whole world, Rome, still, without Love,
The world isn't the world, and Rome can't be Rome.

"It's love!" Marie answers.
Light (1919), Ch. XXIII - Face To Face

Variant: I love you, even if there isn’t any me, or any love, or even any life. I love you.
Source: Dear Scott, Dearest Zelda: The Love Letters of F. Scott and Zelda Fitzgerald

Source: The Moral Judgment of the Child (1932), Ch. 2 : Adult Constraint and Moral Realism, § 1 : The Method <!-- p. 116 -->
Ch. 2 : Adult Constraint and Moral Realism p. 132 -->
Context: In real life the child is in the presence, not of isolated acts, but of personalities that attract or repel him as a global whole. He grasps people's intentions by direct intuition and cannot therefore abstract from them. He allows, more or less justly, for aggravating and attenuating circumstances. This is why the stories told by the children themselves often give rise to different evaluations from those suggested by the experimenter's stories.

Source: Rose in Bloom

Bubbles : A Self-Portrait (1976), p. 114
Context: I needed to sing — desperately. My voice poured out more easily because I was no longer singing for anyone's approval; I was beyond caring about the public's reaction, I just wanted to enjoy myself. … I had found a kind of serenity, a new maturity, as a result of my childrens' problems. I didn't feel better or stronger than anyone else but it seemed no longer important whether everyone loved me or not — more important now was for me to love them. Feeling that way turns your whole life around; living becomes the act of giving.