“Be careful in always having a good beacon fire, as the signals entirely depend upon it, that the ships may enter the bay in safety.”
Precis of the Archives of the Cape of Good Hope, January 1656 - December 1658, Riebeeck's Journal, H. C. V. Leibrandt, Cape Town 1897, p. 104
Jan van Riebeeck ordered the establishment of a kraal and signaling post on Robben Island. In 1658 Van Riebeeck wrote to the men stationed there.
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Jan van Riebeeck 4
Dutch colonial governor 1619–1677Related quotes

On the Conservative leader Bonar Law's election slogan, "Tranquillity"; speech in the Stoll Picture Theatre, Kingsway (4 November 1922), quoted in John Campbell, Lloyd George: The Goat in the Wilderness, 1922–1931 (1977), p. 34
Leader of the National Liberal Party

Source: Defending increased naval expenditure; speech in Brighton (19 November 1895), quoted in The Times (20 November 1895), p. 7

Existentialism Is a Humanism, lecture http://www.marxists.org/reference/archive/sartre/works/exist/sartre.htm (1946)
Context: We will freedom for freedom’s sake, in and through particular circumstances. And in thus willing freedom, we discover that it depends entirely upon the freedom of others and that the freedom of others depends upon our own. Obviously, freedom as the definition of a man does not depend upon others, but as soon as there is a commitment, I am obliged to will the liberty of others at the same time as my own. I cannot make liberty my aim unless I make that of others equally my aim.

Source: Freakonomics: A Rogue Economist Explores the Hidden Side of Everything

“The entire vitality of art depends upon its being either full of truth, or full of use”
Lecture IV
Lectures on Art (1870)
Context: The entire vitality of art depends upon its being either full of truth, or full of use; and that, however pleasant, wonderful, or impressive it may be in itself, it must yet be of inferior kind, and tend to deeper inferiority, unless it has clearly one of these main objects, — either to state a true thing, or to adorn a serviceable one.

A Conversation with Ward Cunningham (2003), To Plan or Not To Plan
Context: I could say, "Wait! Wait! I know what's going to happen down here!" Well you knew what was going to happen down here. How does it help us get our job done for me to tell you what's going to happen down here? You could say, "Stop! I want to draw on the white board what we're going to do tomorrow, because I can see it coming." Well maybe I can see it coming too, but why make a commitment? It will come soon enough. So, we're certainly here and now, but I think we can become excellent predictors. It's just that we're careful not to depend upon prediction anymore than we have to.

“Veracity, as thou wilt learn,” answered the Jinnee, “is not invariably the Ship of Safety.”
Source: The Brass Bottle (1900), Chapter 17, “High Words”