In Roald Dahl's book, The BFG, the phrase "Two rights don't equal a left" suggests that simply having two valid choices or viewpoints doesn't necessarily lead to a correct or logical conclusion. This highlights the importance of context and understanding in decision-making, indicating that the sum of certain options can lead to confusion rather than clarity.

The character in the story uses this expression to emphasize that not all combinations of actions or beliefs will yield a desirable outcome. It encourages readers to think critically about how they assess situations and make decisions, reminding them that logic can sometimes be counterintuitive.