“He who knows best knows how little he knows.”

Rabbit Redux (1969)

Source: Magic Bleeds

The Education of Henry Adams (1907)
Context: ... education should try to lessen the obstacles, diminish the friction, invigorate the energy, and should train minds to react, not at haphazard, but by choice, on the lines of force that attract their world. What one knows is, in youth, of little moment; they know enough who know how to learn. Throughout human history the waste of mind has been appalling, and, as this story is meant to show, society has conspired to promote it. No doubt the teacher is the worst criminal, but the world stands behind him and drags the student from his course. The moral is stentorian. Only the most energetic, the most highly fitted, and the most favored have overcome the friction or the viscosity of inertia, and these were compelled to waste three-fourths of their energy in doing it.

Source: The Prince

Source: Acheron

Section 18 (p. 103)
When HARLIE Was One (1972)

Qui sait tout souffrir peut tout oser.
Variant: He who knows how to suffer everything can dare everything.
Source: Reflections and Maxims (1746), p. 176.

Lord Hornblower (1946), p. 52.