I've seen this quote multiple times, and particularly after reading this post, I find myself needing to add the same clarification, lest the quote be misused.
The idea contained applies if and only if there is a designer able to predict your actions with a high degree of certainty. And even then, it's useful advice if and only if you agree with the designer's intent.
Another month has passed and here is a new rationality quotes thread. The usual rules are: