According to anyone who believes that there is no God, life has no meaning. Let’s go with that (I don’t believe this but hey, you get people at where they’re at).
“So I have no meaning in my life. I just do whatever I want, ’cause who cares? Then one day someone saves me from drowning in my pool. Suddenly meaning is poured into my life. No longer do I live the same. I look at the world differently. I want to give back to the person what they gave to me. So I ask them what I can do to repay them. They tell me that I can show my thankfulness to them by doing the same to others . So from then on I am not living for myself, but for the one who saved me. I help others in effort to please my savior.”
This “story” provides an explanation for why Christians see things differently, and act differently. We don’t see things the same way others do because we have a meaning in our lives that our Savior gave to us. We see others hurts and sorrows as an opportunity to show them the meaning our Savior can give them like he did us.