Egocentricism, i.e. the practice of acquiring values in the long-range (including social ones) by controlling one's environment, is the ultimate virtue.
The following quotations are from "The Virtue of Selfishness" by Ayn Rand:
"Life can be kept in existence only by a constant process of self-sustaining action. The goal of that action, the ultimate VALUE which, to be kept, must gained through its every moment, is the organism's LIFE. .... An organism's life is its STANDARD OF VALUE: that which furthers its life is the GOOD, that which threatens it is the EVIL." -- page 17;
"...there are no conflicts of interest among rational men." -- page 57;
"...a rational man never holds a desire or pursues a goal which cannot be achieved directly or INDIRECTLY by his own effort." -- page 59;
"...a rational man never distorts or corrupts his own standards and judgment in order to appeal to the irrationality, stupidity or dishonesty of others." -- page 60;
"...the gain of one man does not represent the loss of another..." -- pages 62 & 63;
You should never act in a way which is contrary to your interest, that is, your life, regardless of the consequence to others.