Walking by sight has severe limitations and carries greater consequences than most people are aware.Wouldn't you rather walk by sight?
Eg, you show up on the job one day and the boss rips you a new derriere for no apparent reason. And when you try to find out why, it just gets worse for you.
So, after working for a couple days, you learn that the boss's mom died in a horrendous accident that for inexplicable reasons, he feels responsible for.
Walking by sight would have resulted in you doing something that was unnecessary, or dangerous.
Walking in a manner that views the eternal, and not the temporal gave you the perspective that his outburst had nothing to do with you or your work...
This is just one of thousands of different things that make walking by sight invalid.