Have you ever been stuck with a problem and no matter how hard you try you can’t seem to find a solution? Have you considered that the problem is not the problem; the problem is your ‘same kind of thinking’. This limited thinking never helps you break out of the narrow context of your problems, alongside failing to tap into external resources.
Einstein’s point was that anyone’s knowledge and understanding is limited to his own experience, training, education, and information sources. Simply put, thinking outside the box is a necessary and extremely effective way to fix problems and come up with new ideas.