It started with just a few incidences of neglect on things that I should have been thinking about. Like a snowball rolling down the hill gathering snow, those incidences quickly grew in number until I was always thinking about nothing of importance, and instead filling my mind with anything and everything of the world.
I got jolted out of my slide of thoughtlessness with this verse. "But we are not of those who shrink back and are destroyed, but of those who believe and are saved" Hebrews 10:39. If I just let myself drift along with the river of worldly thoughts, I am heading for the dangerous waterfall. Even if we do nothing, we are still drifting towards the danger. We need to keep fighting the current.
As always though, God seems to know better than us. He knows that we are creatures that can think, to be able to determine right and wrong. He knows that worldly things have no real value anyway. Why would we want to sacrifice our thoughts on something worthless?
Thinking can get tired after some time, but the alternative, just drifting in thoughtlessness is much worse.