It's about not taking things in life for granted, not assuming you have all the answers and realizing that you might not have as much control over your destiny as you once might have thought. The song is a metaphor -- the "wreckers" of olden times were looters who, by lighting bonfires along coastlines to resemble light houses, would steer ships off course and cause them to wreck against the shore so they could plunder their remains.
It's about not taking things in life for granted, not assuming you have all the answers and realizing that you might not have as much control over your destiny as you once might have thought. The song is a metaphor -- the "wreckers" of olden times were looters who, by lighting bonfires along coastlines to resemble light houses, would steer ships off course and cause them to wreck against the shore so they could plunder their remains.