You didn't include the paragraphs in your question.
Based on the word "thunder" it could mean "fear". Thunder is a situation which brings fear to people. The sound of <em>thunder</em> signifies fear or calamity.
Therefore,
The phrase which could help the reader understand the meaning of the word "<em>thunder</em>" in the same paragraph is "make a people <em>fear</em> god".
To make a group of people fear God because He knows the unknown and capable of doing so many things without anyone questioning Him.
