i am a little confused by this. wont the people left behind notice you are missing?

You may be there physically, but your enlightened heart will bring the separation. Being given sight is truly a miracle, a gift of mercy from Above. It's grievous that the light that we share will many times push others away. We know that's not our intention but only to see others free. That's how you can know that the sight that you have is from Above. We are in the world, but no longer a part of it's system.