“Alert and vigilant living itself is a `Sadhana' in the true sense.”
Quotations from Gurudev’s teachings, Chinmya Mission Chicago
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Chinmayananda Saraswati 118
Indian spiritual teacher 1916–1993Related quotes
"Our Contemporary Christ," in Borderland Theology and Other Essays (1968), p. 82

1960s, Memorial Day speech (1963)

The New Yorker (March 29, 1976)
The Atheist's Guide to Reality (2011)
Context: There is, however, a much more convincing argument that needs to be put on the table before we really begin turning common sense upside down. It is the overwhelming reason to prefer science to ordinary beliefs, common sense, and direct experience. Science is just common sense continually improving itself, rebuilding itself, until it is no longer recognizable as common sense. It is easy to miss this fact about science without studying a lot of history of science—and not the stories about science, but the succession of actual scientific theories and how common sense was both their mother and their midwife.

As quoted in The Life Of Lord Courtney (1920) by G. P. Gooch
The statement "The price of peace is eternal vigilance" has been widely attributed to others, including George Marshall, however even Courtney's use of it is probably derived from an earlier statement with several variants:
The price of freedom is eternal vigilance.
The price of liberty is eternal vigilance.
Eternal vigilance is the price of liberty.

Quote from a conversation with J.P. Hodin, 28 August 1959; extract from J.P. Hodin, Barbara Hepworth, London, 1961, Two Conversations with Barbara Hepworth: 'Art and Life' and 'The Ethos of Sculpture', pp. 23–24
1947 - 1960