Daniel 7, 8

To Daniel was given visions of future leaders, kingdoms, and events. God will do nothing except He first reveal it to His prophets upon the earth. We may not understand these fore-sights, but eventually they will come to pass and we will then understand them.

In a sense, they also prevent us from being overcome with fear. To know that God is the Omnipotent Custodian of the future is comforting.

These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world. John 16:33