Verse 2 says we do not have to fear even if the earth was removed and the mountains were carried unto the sea. According to verses 2 & 3 regardless of what happens, we do not have to fear. The bible says that perfect love casts out all fear. (1 John 4:18) So if we are walking in love, we will not have any fear.
Verse 10 says that we are to be still and know that God is God. God will be exalted among the heathen and in the earth. Because we know the Lord he will be with us and is our refuge. We have absolutely no need whatsoever to be afraid or feel that we have no hope, because we have God on our side. What else could we possibly need? Praise God because He is always with us, every step of the way.