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What other dungeon is so dark as one's own heart. What jailer so inexorable as one's self?
Nathaniel Hawthorne

We learn by teaching.
Traditional Proverb

All the knowledge I possess everyone can acquire, but my heart is all my own.
Johann Wolfgang von Goethe

He who teaches, learns.
French Proverb

Math seems to endow one with something like a new sense.
Charles R. Darwin

Math is radical!.
Bumper Sticker

Pure math is, in its way, the poetry of logical ideas.
Roger Bacon

Spanish Tutoring in Pasadena