“No man ever praised two persons equally – and pleased them both.”

Source: Works and Days (c. 700 BC), line 11.

Source: Memoirs of a Geisha

As quoted in Visions : How Science Will Revolutionize the Twenty-First Century (1999) by Michio Kaku, p. 295
2000s and attributed from posthumous publications

Douter de tout ou tout croire, ce sont deux solutions également commodes, qui l'une et l'autre nous dispensent de réfléchir.
Preface, Dover abridged edition (1952), p. xxii
Science and Hypothesis (1901)

Author's note, revised edition (1992).
The Carpet People (1971; 1992)
Source: A Hat Full of Sky

Source: A Funeral for the Eyes of Fire (1975), Chapter 11, “Usurpation: Two Meteors, Prodigal of Light” (p. 196)

The Shared Patio (2005)
Context: Do you have doubts about life? Are you unsure if it is really worth the trouble? Look at the sky: that is for you. Look at each person's face as you pass them on the street: those faces are for you. And the street itself, and the ground under the street, and the ball of fire underneath the ground: all these things are for you. They are as much for you as they are for other people. Remember this when you wake up in the morning and think you have nothing. Stand up and face the east. Now praise the sky and praise the light within each person under the sky. It's okay to be unsure. But praise, praise, praise.

God Knows (1984)