This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...ask of applying this principle to a concrete, specific purpose — the purpose of living a life proper to a rational being — belongs to every individual man, and the life he has to live is his
read full book
Man must choose his actions, values and goals by the standard of that which is proper to man — in order to achieve, maintain, fulfill and enjoy that ultimate value, that en
d in itself, which is his own life.
Value is that which one acts to gain and/or keep — virtue is the act by which one gains and/or keeps it. The three cardinal values of the Obje...