“We are either progressing or retrograding all the while. There is no such thing as remaining stationary in this life.”

Introduction, in Hirst (1909), pp. 287–288
The National System of Political Economy (1841)

Introduction
The Wedge (1944)
Context: A man isn’t a block that remains stationary though the psychologists treat him so — and most take an insane pride in believing it. Consistency! He varies; Hamlet today, Caesar tomorrow; here, there, somewhere — if he is to retain his sanity, and why not?
The arts have a complex relation to society. The poet isn’t a fixed phenomenon, no more is his work.

Attributed in Einstein: The Life and Times by Ronald W. Clark (1971), p. 737. The only source given in the end notes is "personal information". Einstein is said to have made this comment when a box of candy was being passed around after dinner, and he said that his doctor wouldn't let him eat it. The book also says that 'A friend asked him why it was the devil and not God who had imposed the penalty. "What's the difference?" he answered. "One has a plus in front, the other a minus."'.
Attributed in posthumous publications

Source: A Family Collection: Life on the Farm and in the Country, Making a Home; the Ways of the World, a Woman's Role

Cellar Door, Spring 1985, Vol. 12(2), p. 50.

Source: The Production of Security (1849), p. 40

Source: Untamed

VI, 41
Meditations (c. 121–180 AD), Book VI

From 1980s onwards, Cosmography (1992)