Nothing is yours. what does it mean? At the end of life you are left with nothing. So who owns all this?

All is His. Nothing is yours,

So what to do in life? Should I give up all work? This does not mean sitting idle at home shunning all work. Man must engage in action (karma) but engage in action without desire (nishkaam karma), and may desire to live in this world for 100 years while engaging in action (karma). In this way man does not attached to the karma or action. In this way human is not covered with a coating of action (karma). Without this, there is no way or recourse.