“To know oneself means, among other things, to know oneself qua non-sage: that is, not as a sophos, but as a philo-sophos, someone on the way toward wisdom.”

Le vrai moyen d'être trompé, c'est de se croire plus fin que les autres.
Maxim 127.
Reflections; or Sentences and Moral Maxims (1665–1678)

La plus grande chose du monde, c'est de savoir être à soi.
Book I, Ch. 39
Essais (1595), Book I
Source: The Complete Essays

Source: Literary Years and War (1900-1918), The Riddle Of The Sands (1903), p. 1.

Savoir se libérer n'est rien; l'ardu, c'est savoir être libre.
The Immoralist, Chapter 1 http://books.google.com/books?id=MPmRAAAAIAAJ&q=%22Savoir+se+lib%C3%A9rer+n'est+rien+l'ardu+c'est+savoir+%C3%AAtre+libre%22&jtp=17#v=onepage (1902)
The Immoralist (1902)

Way to Wisdom: An Introduction to Philosophy (1951) as translated by Ralph Mannheim, Ch. 1, What is Philosophy?, p. 12
Variant translation: It is the search for the truth, not possession of the truth which is the way of philosophy. Its questions are more relevant than its answers, and every answer becomes a new question.
Context: The Greek word for philosopher (philosophos) connotes a distinction from sophos. It signifies the lover of wisdom (knowledge) as distinguished from him who considers himself wise in the possession of knowledge. This meaning of the word still endures: the essence of philosophy is not the possession of the truth but the search for truth. … Philosophy means to be on the way. Its questions are more essential than its answers, and every answer becomes a new question.

Source: Pali Canon, Sutta Pitaka, Khuddaka Nikaya (Minor Collection), Dhammapada, Ch. 20, Verse 282

In Search of the Miraculous (1949), Ch. 10. p. 203

Origins (1977)

Source: Sculpting in Time (1986), p. 180