A member of our brother forum Bogleheads® España has summarized William Bernstein's book, The Four Pillars of Investing, in 10 tweets.
See: Los 4 pilares de la inversión en 10 tweets - Bogleheads® España (en español)
The forum thread translated to English: The 4 pillars of the investment in 10 tweets
The Twitter link translated to English: Google Translate
Disclaimer: I'm a member of both forums.