“Act well at the moment, and you have performed a good action to all eternity.”
Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 4
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Johann Kaspar Lavater 24
Swiss poet 1741–1801Related quotes

Light, Power and Wisdom (1959), p. 6; note that the short phrase "Be good, do good" had occurred in spiritual teachings of others in the 19th century, usually in conjunction with other injunctions. "Be Good, Do Good" became a prominent motto of the Divine Life Society.
Light, Power and Wisdom (1959), p. 207
Variant: Be good, do good, be kind, be compassionate.

Bk. IX, ch. 1
War and Peace (1865–1867; 1869)
Context: In historical events great men — so-called — are but labels serving to give a name to the event, and like labels they have the least possible connection with the event itself. Every action of theirs, that seems to them an act of their own free will, is in an historical sense not free at all, but in bondage to the whole course of previous history, and predestined from all eternity.

“All you owe the public is a good performance.”
To Frank Sinatra, as quoted in The New York Times (17 May 1994)

Volume 2, Ch. 1
Fiction, The Book of the Long Sun (1993–1996)

The Spirit of Revolt (1880)
Context: Whoever has a slight knowledge of history and a fairly clear head knows perfectly well from the beginning that theoretical propaganda for revolution will necessarily express itself in action long before the theoreticians have decided that the moment to act has come. Nevertheless, the cautious theoreticians are angry at these madmen, they excommunicate them, they anathematize them. But the madmen win sympathy, the mass of the people secretly applaud their courage, and they find imitators. In proportion as the pioneers go to fill the jails and the penal colonies, others continue their work; acts of illegal protest, of revolt, of vengeance, multiply.
Indifference from this point on is impossible. Those who at the beginning never so much as asked what the "madmen" wanted, are compelled to think about them, to discuss their ideas, to take sides for or against. By actions which compel general attention, the new idea seeps into people's minds and wins converts. One such act may, in a few days, make more propaganda than thousands of pamphlets.
Above all, it awakens the spirit of revolt: it breeds daring. The old order, supported by the police, the magistrates, the gendarmes and the soldiers, appeared unshakable, like the old fortress of the Bastille, which also appeared impregnable to the eyes of the unarmed people gathered beneath its high walls equipped with loaded cannon. But soon it became apparent that the established order has not the force one had supposed.

Collected Poems (1992), When the Watchman Saw the Light (1900)
Context: So let's not exaggerate.
The light is good; and those coming are good,
their words and actions also good.
And let's hope all goes well.
But Argos can do without the house of Atreus.
Ancient houses are not eternal.