Teenagers also sometimes think, 'What's the use? The world will soon be blown all apart and come to an end.' That feeling comes from fear, not from faith. No one knows the hour or the day (see D&C 49:7), but the end cannot come until all of the purposes of the Lord are fulfilled. Everything that I have learned from the revelations and from life convinces me that there is time and to spare for you to carefully prepare for a long life.