As I was driving home from church after Mass, I looked again at the many granite boulders on both sides of the road and knew that they wouldn't be around forever. The dinosaurs had disappeared. Geologists had shown that drylands were once land under water and vice versa. A large meteoroid hitting the earth can instantly change its landscape. Then I thought of the billions of celestial bodies in space and as far as we know, we are the only creatures living on this planet of earth with perfect conditions for sustaining our lives. And amazingly, we also happen to understand good and evil. At this instant, I was sure of the existence of God our creator. Then I knew that mankind as a whole wouldn't be around forever either. In the first place, the size of earth is limited. Our survival so far is just a chapter in the book that has not come to its end yet. Now, I was certain that there would be the Second Coming of Jesus to end the present world as we know it.
With these realizations, it's clear that we must make maximum good use of the time we have. All acts not motivated by love for God would be simply wasted. It's good to know exactly what we are doing.