At an amusement park, you might find a roller coaster that has two lines. Over one line is a sign that says, "Forward," and over the other line a sign that says, "Backward." It's your choice to ride looking forward or looking backward. There are also two lines in life, and two cars you can ride in. One says, "Forward" and the other says, "Backward." You choose. You probably don't want to ride looking back at where you've already been. Instead, you probably want to ride looking ahead to see where you're going.