Source: The Functions of the Executive (1938), p. 19 (in 1968 edition)
“We cannot seek or attain health, wealth, learning, justice or kindness in general. Action is always specific, concrete, individualized, unique.”
Actually from one of John Dewey's lectures, reprinted in his Reconstruction in Philosophy (2004), p. 96.
Misattributed
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Benjamin Jowett 10
Theologian, classical scholar, and academic administrator 1817–1893Related quotes

1970s, Proclamation 4417 (1976)
Variant: I call upon the American people to affirm with me this American Promise -- that we have learned from the tragedy of that long-ago experience forever to treasure liberty and justice for each individual American, and resolve that this kind of action shall never again be repeated.

“As the expression goes, we spend our youth attaining wealth, and our wealth attaining youth.”
Source: Generation X: Tales for an Accelerated Culture

From The Great Judge by Philip Hamburger (1946).
Extra-judicial writings

“Art always opts for the individual, the concrete; art is not Platonic.”
"Gauchesque Poetry" ["La poesía gauchesca"]
Discussion (1932)

“we are unique individuals with unique experiences”
Men Are from Mars, Women Are from Venus

“Wealth that can last generations can now be attained in the shortest time ever in history.”
Future Proofing You (2021)

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book I, Chapter I, Sec. 13
Methods of Mathematics Applied to Calculus, Probability, and Statistics (1985)