“Yet do much less, so much less, Someone says,
(I know his name, no matter) — so much less!
Well, less is more, Lucrezia: I am judged.”

"Andrea del Sarto", line 70
"Less is more" is often misattributed to architects Buckminster Fuller or Ludwig Mies van der Rohe. It is something of a motto for minimalist philosophy. It was used in 1774 by Christoph Martin Wieland.
Men and Women (1855)
Context: I do what many dream of, all their lives,
— Dream? strive to do, and agonize to do,
And fail in doing. I could count twenty such
On twice your fingers, and not leave this town,
Who strive — you don't know how the others strive
To paint a little thing like that you smeared
Carelessly passing with your robes afloat —
Yet do much less, so much less, Someone says,
(I know his name, no matter) — so much less!
Well, less is more, Lucrezia: I am judged.
There burns a truer light of God in them,
In their vexed beating stuffed and stopped-up brain,
Heart, or whate'er else, than goes on to prompt
This low-pulsed forthright craftsman's hand of mine.