“Learning is not by going to school, books is not by reading; but knowing what you went their for and understanding what you've read in those books.”
Related quotes

“What's the point of having a library full of books you've already read?”
“You want to know about anybody? See what books they read, and how they've been read…”
Source: The Bone People
Source: The Fan-Maker's Inquisition: A Novel of the Marquis de Sade

“You can only learn so much by reading. You cannot learn to ride a bicycle by reading a book.”
Rich Dad Poor Dad: What the Rich Teach Their Kids About Money-That the Poor and the Middle Class Do Not!
Source: Persecution and the Art of Writing (1952), How to Study Spinoza's Theologico-Political Treatise, p. 144

Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 40.