This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...ditions I mean metaphysically normal, normal in the nature of things, and appropriate to human existence. Men can live on land, but not in water or in a raging fire. Since men are not omnipotent
, it is metaphysically possible for unforeseeable disasters to strike them, in which case their only task is to return to those conditions under which their lives can continue. By its nature, an
emergency situation is temporary; if it were to last, men would perish.
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It is only in emergency situations that one should volunteer to help strangers, if it is in one’s power. ...