In this chapter, God gave the children of Israel the 10 commandments. Then They saw lightning and thunderings and became afraid and did not want God to speak to them because of fear of death. God tested them or the King James says proved them. This created in the people a godly fear so they would not sin against God.
As you go through your day today, fear God but do not be afraid of what He is going to take you through today! He loves you and wants to guide you into all truth.