“Become selfish if you must survive. Though, don't die without reviving others.”
Related quotes

1930s, Quarantine Speech (1937)
Context: If civilization is to survive, the principles of the Prince of Peace must be restored. Shattered trust between nations must be revived. Most important of all, the will for peace on the part of peace-loving nations must express itself to the end that nations that may be tempted to violate their agreements and the rights of others will desist from such a cause. There must be positive endeavors to preserve peace. America hates war. America hopes for peace. Therefore, America actively engages in the search for peace.

“Act as if you were to die tomorrow, but to die in order to survive and be eternalized.”
The Tragic Sense of Life (1913), XI : The Practical Problem
Context: And what is its moral proof? We may formulate it thus: Act so that in your own judgment and in the judgment of others you may merit eternity, act so that you may become irreplaceable, act so that you may not merit death. Or perhaps thus: Act as if you were to die tomorrow, but to die in order to survive and be eternalized. The end of morality is to give personal, human finality to the Universe; to discover the finality that belongs to it — if indeed it has any finality — and to discover it by acting.

Source: No Way Out (2002), Ch. 2: Nothing To Be Transformed
Context: Whether you are interested in moksha, liberation, freedom, transformation, you name it, you are interested in happiness without one moment of unhappiness, pleasure without pain, it is the same thing. Whether one is here in India or Russia or in America or anywhere, what people want is to have one without the other. But there is no way you can have one without the other. This demand is not in the interest of the survival of this living organism.
The Communistic Societies of the United States (1875), p. 76

“There are all these moments you don't think you will survive. And then you survive.”
Source: Two Boys Kissing
Source: How the Irish Saved Civilization (1995), Ch. VI What Was Found

Original: (it) Non dare importanza al comportamento scorretto di molte persone: non è egoismo, ma un atto di sopravvivenza.
Source: prevale.net