“Men of science in former ages worked in secret, and instead of publishing their discoveries, taught them in secret to carefully selected pupils.”
The Occult World, Introduction (1881)
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Alfred Percy Sinnett 5
English writer and Theosophist 1840–1921Related quotes

“The secret is comprised in three words — Work, finish, publish.”
His well-known advice to the young William Crookes, who had asked him the secret of his success as a scientific investigator, as quoted in Michael Faraday (1874) by John Hall Gladstone, p. 123

The Scouter http://www.thedump.scoutscan.com/outlook.html (January, 1912)

“The secret of education lies in respecting the pupil.”
“There are no secrets in science.”
The Physicists (1981), published posthumously.

“The secret of liberty is to enlighten men, as that of tyranny is to keep them in ignorance.”
As quoted in Human Rights and Freedoms in the USSR (1981) by Fedor Eliseevich Medvedev and Gennadiĭ Ivanovich Kulikov, p. 221
Original: Le secret de la liberté est d'éclairer les hommes, comme celui de la tyrannie est de les retenir dans l'ignorance
Variant: The secret of freedom lies in educating people, whereas the secret of tyranny is in keeping them ignorant.
Source: Public statement (November 1792), quoted in Oeuvres de Maximilien Robespierre (1840), Volume 2, p. 253 http://books.google.com/books?id=iSMVAAAAQAAJ