What is the primary importance of the parable wiesel tells at the beginning of his speech?

It seems that you have missed the given options for this question, but anyway here is the answer. This question is based on Wiesel's speech and he started this with a parable. So the primary importance of the parable that Wiesel tells is that, it explains how important memory is to Wiesel. This parable is a legend from Jewish folklore illustrating the importance of memory.  Hope this answer helps.