Every time we fly on an airplane, we get an important life instruction from the flight attendants, that for some, we really ought to take it with us even when we leave the plane.  They instructs us to "put your oxygen mask on first, before helping others"  - in case of a sudden loss in cabin pressure. An important metaphor for some who run around taking care of everything and everyone else, but themselves. But don't get it twisted either, this instruction didn't say "be selfish" , it say's take care of you 1st and then help others.