According to Osho, nothing happens—there’s nothing to give back. A true Master gives you nothing new; he only removes your illusions—especially ego—and reveals what has always been yours. You owe him nothing, not even thanks. The only ‘return’ is not to be angry: forgive, drop projections, and allow the taking-away to uncover your own reality.
You can’t pay the Master back—he just removes what hides your own truth; your part is to relax, forgive, and let go.