Yellow squares are to take one of the letters from the yellow squares at the top in the same column. White squares are to take one of the letters from the white squares to the left in the same row. Each shown letter is used exactly once. Only black squares can separate words, not line breaks, and remember that black squares can possibly represent punctuation, such as an apostrophe.
When completed, you'll have the full quotation.
author: ISAAC ASIMOV