Some people worry about the end times.
God promised that if we obey His commandments that He would never leave us nor forsake us. Christ in turn gave them seven events. These Seven events are the seven seals, the seven trumpets, and the seven vials of the book of Revelation. Therefore, if you can understand the simplicity of Christ's teaching, as many children can, you can understand the events of the end times, and have no anxieties whatsoever. Don't let somebody tell you this was fulfilled in 70 AD by a little Roman general named Titus - the west wall still stands, for one thing.